Clear click listener when the icon is removed.

- The click listener should be removed, otherwise, it can still active
  and clickable when the TaskView is bound to a new Task whose icon
  has not yet been loaded, which can cause crash.

Bug: 118834133
Change-Id: Ifd9fd8fe99b6177851d366f0c21f8fad59f1950e

quickstep/src/com/android/quickstep/views/TaskView.java

@@ -300,6 +300,7 @@ public class TaskView extends FrameLayout implements PageCallbacks {
             });
         } else {
             mIconView.setDrawable(null);
+            mIconView.setOnClickListener(null);
             mIconView.setOnLongClickListener(null);
         }
     }