Revert "Fix transition return issues when more than 1 level depth"

This reverts commit 6d834d86fb.

Reason for revert: <http://b/159230864 WhatsApp image is visible after existing a chat>
Bug: 159230864

Change-Id: Ib266cff2e06a82ae9a0e85142ef80ae00328a040

core/java/android/app/ExitTransitionCoordinator.java

@@ -434,8 +434,7 @@ class ExitTransitionCoordinator extends ActivityTransitionCoordinator {
                 mSharedElementNotified = true;
                 delayCancel();
 
-                if (!mActivity.isTopOfTask() || (mIsReturning && !mActivity.isTaskRoot()
-                        && !mSharedElements.isEmpty())) {
+                if (!mActivity.isTopOfTask()) {
                     mResultReceiver.send(MSG_ALLOW_RETURN_TRANSITION, null);
                 }