Clear cached override frame when window removed

When removing a window, the corresponding WindowContainer of a
InsetsSourceProvider will be set to null, instead of directly removing
the provider. We need to clear all recorded information, including the
override frames to make sure the removal in effect to all windows.

Test: See b/252455307
Bug: 252455307
Change-Id: I2e59485fdf25af743afe918525ed5e6872e6fff7