layershell: Implement dockWantsInput

Kwin logic has a separate method for if a dock wants input, given layer
shells are always docks it is important to implement this.

src/layershellv1window.cpp

@@ -136,6 +136,11 @@ bool LayerShellV1Window::wantsInput() const
     return acceptsFocus() && readyForPainting();
 }
 
+bool LayerShellV1Window::dockWantsInput() const
+{
+    return wantsInput();
+}
+
 StrutRect LayerShellV1Window::strutRect(StrutArea area) const
 {
     switch (area) {

src/layershellv1window.h

@@ -36,6 +36,7 @@ public:
     bool isResizable() const override;
     bool takeFocus() override;
     bool wantsInput() const override;
+    bool dockWantsInput() const override;
     StrutRect strutRect(StrutArea area) const override;
     bool hasStrut() const override;
     void destroyWindow() override;