Ensure indicator clear transation application when drag end

In I6f3f54de85bd564158b1cfcaf91a1955964cf575, logic was added to delay
the drag indicator removal when a drag ends.

However, in the code path where needDragIndicatorCleanup is true, the
transaction to clear the indicator was not applied. This could cause the
indicator to remain visible after the drag operation finished.

This change ensures the transaction is explicitly applied in this case,
correctly clearing the drag indicator.

Flag: com.android.window.flags.enable_window_drop_smooth_transition
Bug: 438189205
Test: manual
Change-Id: I2921c4627891a260c82fe16e41e48b18ca57c524