[WindowDecor2] Fix containerSurfaceChanged check

This CL fixes a bug in WindowDecor2 where the containerSurfaceChanged in
DefaultWindowDecoration is not correctly checking the difference between
the decorationContainerSurface before and after relayout. This was
causing the DragResizeInputListener to not be recreated as needed when
the task is minimized then restored.

Fixes: 437193997
Test: Manual - minimize and restore the task then verify that
drag-to-resize is WAI
Test: atest WMShellUnitTests:com.android.wm.shell.windowdecor
Flag: EXEMPT bugfix

Change-Id: I685e1c9cbdc3cb06907ecf6d85897c1ee8624ec3