Fix scroll direction on window wheel command

Experimental testing in real world showed it's just a signing issue
in this specific case. The events passed to wayland clients scroll
in correct direction.

autotests/wayland/pointer_input.cpp

@@ -456,9 +456,9 @@ void PointerInputTest::testModifierScrollOpacity()
     quint32 timestamp = 1;
     QFETCH(int, modifierKey);
     waylandServer()->backend()->keyboardKeyPressed(modifierKey, timestamp++);
-    waylandServer()->backend()->pointerAxisVertical(5, timestamp++);
-    QCOMPARE(window->opacity(), 0.6);
     waylandServer()->backend()->pointerAxisVertical(-5, timestamp++);
+    QCOMPARE(window->opacity(), 0.6);
+    waylandServer()->backend()->pointerAxisVertical(5, timestamp++);
     QCOMPARE(window->opacity(), 0.5);
     waylandServer()->backend()->keyboardKeyReleased(modifierKey, timestamp++);
 

input.cpp

@@ -554,7 +554,7 @@ public:
         Options::MouseCommand command = Options::MouseNothing;
         if (event->modifiers() == options->commandAllModifier()) {
             wasAction = true;
-            command = options->operationWindowMouseWheel(event->angleDelta().y());
+            command = options->operationWindowMouseWheel(-1 * event->angleDelta().y());
         } else {
             command = c->getWheelCommand(Qt::Vertical, &wasAction);
         }