Fix warnings, cleanup

Author: leolost2605

src/Gestures/RootTarget.vala

@@ -8,8 +8,6 @@
 public interface Gala.RootTarget : Object, GestureTarget {
     public void add_gesture_controller (GestureController controller) requires (controller.target == null) {
         controller.attached (this);
-
-        // Bind the controller lifetime to #this lifetime
         weak_ref (controller.detached);
     }
 }

src/Widgets/WindowSwitcher/WindowSwitcher.vala

@@ -7,7 +7,7 @@
  * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
-public class Gala.WindowSwitcher : CanvasActor, RootTarget, GestureTarget {
+public class Gala.WindowSwitcher : CanvasActor, GestureTarget, RootTarget {
     public const int ICON_SIZE = 64;
     public const int WRAPPER_PADDING = 12;
 

src/Zoom.vala

@@ -5,7 +5,7 @@
  * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
-public class Gala.Zoom : Object, RootTarget, GestureTarget {
+public class Gala.Zoom : Object, GestureTarget, RootTarget {
     private const float MIN_ZOOM = 1.0f;
     private const float MAX_ZOOM = 10.0f;
     private const float SHORTCUT_DELTA = 0.5f;