Let WindowState apply compat configuration override when needed

For apps without ActivityRecord such as IME, it is necesary to override
the configuration to apply the compat behavior when needed in
WindowState level. This patch apply the corresponding override when the
ActivityRecord doesn't exist.

Bug: 350874546
Test: WindowStateTests
Test: dumpsys window windows to check config
Flag: com.android.window.flags.insets_decoupled_configuration
Change-Id: I32592d55814abf68d1756a724128e2113740354b