Fix Connections warnings

Qt 5.15 introduced new syntax for defining Connections. Fix warnings like this one:
QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }

kcmkwin/kwindecoration/package/contents/ui/Themes.qml

@@ -77,7 +77,9 @@ KCM.GridView {
             }
             Connections {
                 target: kcm
-                onBorderSizeChanged: settingsItem.borderSizesIndex = kcm.borderSize
+                function onBorderSizeChanged() {
+                    settingsItem.borderSizesIndex = kcm.borderSize
+                }
             }
         }
         actions: [
@@ -100,7 +102,9 @@ KCM.GridView {
     }
     Connections {
         target: kcm
-        onThemeChanged: view.currentIndex = kcm.theme
+        function onThemeChanged() {
+            view.currentIndex = kcm.theme
+        }
     }
 }
 

kcmkwin/kwindecoration/package/contents/ui/main.qml

@@ -121,7 +121,9 @@ Kirigami.Page {
 
                                 Connections {
                                     target: kcm
-                                    onThemeChanged: borderSizeComboBox.autoBorderUpdate()
+                                    function onThemeChanged() {
+                                        borderSizeComboBox.autoBorderUpdate()
+                                    }
                                 }
                             }
                             Item {

kcmkwin/kwindesktop/package/contents/ui/main.qml

@@ -20,11 +20,11 @@ ScrollViewKCM {
     Connections {
         target: kcm.desktopsModel
 
-        onReadyChanged: {
+        function onReadyChanged() {
             rowsSpinBox.value = kcm.desktopsModel.rows;
         }
 
-        onRowsChanged: {
+        function onRowsChanged() {
             rowsSpinBox.value = kcm.desktopsModel.rows;
         }
     }

kcmkwin/kwineffects/package/contents/ui/Video.qml

@@ -35,7 +35,7 @@ Multimedia.Video {
         }
         Connections {
             target: videoItem
-            onStopped: {
+            function onStopped() {
                 replayButton.visible = true
             }
         }

plugins/kdecorations/aurorae/themes/plastik/package/contents/ui/PlastikButton.qml

@@ -140,10 +140,14 @@ DecorationButton {
     onPressedChanged: colorize()
     Connections {
         target: decoration.client
-        onActiveChanged: button.colorize()
+        function onActiveChanged() {
+            button.colorize()
+        }
     }
     Connections {
         target: options
-        onColorsChanged: button.colorize();
+        function onColorsChanged() {
+            button.colorize();
+        }
     }
 }

plugins/kdecorations/aurorae/themes/plastik/package/contents/ui/main.qml

@@ -405,10 +405,14 @@ Decoration {
     }
     Connections {
         target: decoration
-        onConfigChanged: root.readConfig()
+        function onConfigChanged() {
+            root.readConfig()
+        }
     }
     Connections {
         target: decorationSettings
-        onBorderSizeChanged: root.readBorderSize();
+        function onBorderSizeChanged() {
+            root.readBorderSize();
+        }
     }
 }

qml/outline/plasma/outline.qml

@@ -47,7 +47,7 @@ Window {
         target: outline
         // when unified geometry changes, this means our window position changed and any
         // animation will potentially be offset and/or cut off, skip the animation in this case
-        onUnifiedGeometryChanged: {
+        function onUnifiedGeometryChanged() {
             if (window.visible) {
                 window.animationEnabled = false
                 svg.setGeometry(outline.geometry)

scripts/desktopchangeosd/contents/ui/main.qml

@@ -17,7 +17,7 @@ Item {
 
     Connections {
         target: workspace
-        onCurrentDesktopChanged: {
+        function onCurrentDesktopChanged() {
             if (!mainItemLoader.item) {
                 mainItemLoader.source = "osd.qml";
             }

scripts/desktopchangeosd/contents/ui/osd.qml

@@ -277,13 +277,15 @@ PlasmaCore.Dialog {
         Connections {
             target: workspace
             onCurrentDesktopChanged: dialogItem.show()
-            onNumberDesktopsChanged: {
+            function onNumberDesktopsChanged() {
                 repeater.model = workspace.desktops;
             }
         }
         Connections {
             target: options
-            onConfigChanged: dialogItem.loadConfig()
+            function onConfigChanged() {
+                dialogItem.loadConfig()
+            }
         }
         Component.onCompleted: {
             view.columns = workspace.desktopGridWidth;

tests/pointerconstraintstest.qml

@@ -67,7 +67,7 @@ ColumnLayout {
 
     Connections {
         target: org_kde_kwin_tests_pointerconstraints_backend
-        onForceSurfaceCommit: {
+        function onForceSurfaceCommit() {
             forceCommitRect.visible = true
         }
     }