Revert "Prevent double touch inputs in the BaseDragLayer"

This reverts commit 68fc44ffad.

Reason for revert: Wrong handling of events

Change-Id: Ic34916123ed6c4ba33f629549dda2cdbc890b413

src/com/android/launcher3/views/BaseDragLayer.java

@@ -273,12 +273,6 @@ public abstract class BaseDragLayer<T extends Context & ActivityContext>
 
     @Override
     public boolean dispatchTouchEvent(MotionEvent ev) {
-        if (ev.getActionIndex() > 0) {
-            // This means there is multiple touch inputs, ignore it, we could also cancel the
-            // previous touch but the user might cancel the drag by accident.
-            return true;
-        }
-
         switch (ev.getAction()) {
             case ACTION_DOWN: {
                 if ((mTouchDispatchState & TOUCH_DISPATCHING_TO_VIEW_IN_PROGRESS) != 0) {