Fix unfold on split screen bounds

App boundaries were not updated during the unfold animation, when there were two apps on the screen.

Bug: 216655763
Test: Unfolded manually in split screen mode.
Change-Id: I80b0fba91b0f018077c62f363eb1898b5e698f11

libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageCoordinator.java

@@ -879,6 +879,7 @@ class StageCoordinator implements SplitLayout.SplitLayoutHandler,
         if (mMainUnfoldController != null && mSideUnfoldController != null) {
             mMainUnfoldController.onSplitVisibilityChanged(mDividerVisible);
             mSideUnfoldController.onSplitVisibilityChanged(mDividerVisible);
+            updateUnfoldBounds();
         }
     }