Fix expanding PiP on TV

When expanding PiP call PipTaskOrganizer.dismissPip() instead of
PipTaskOrganizer.scheduleAnimateResizePip() directly passing null
destination rect (which is causing a crash, while the dismissPip()
retrieves previously saved initial window's bounds and resizes back to
them).

Bug: 153776392
Bug: 153050065
Test: manual
Change-Id: Ieb9eacb3974b586f93732de35beb7edd9833db03

packages/SystemUI/src/com/android/systemui/pip/tv/PipManager.java

@@ -462,8 +462,12 @@ public class PipManager implements BasePipManager, PipTaskOrganizer.PipTransitio
                 mCurrentPipBounds = mPipBounds;
                 break;
         }
-        mPipTaskOrganizer.scheduleAnimateResizePip(mCurrentPipBounds, mResizeAnimationDuration,
-                null);
+        if (mCurrentPipBounds != null) {
+            mPipTaskOrganizer.scheduleAnimateResizePip(mCurrentPipBounds, mResizeAnimationDuration,
+                    null);
+        } else {
+            mPipTaskOrganizer.dismissPip(mResizeAnimationDuration);
+        }
     }
 
     /**