Sync IME visibility to control target, when it changes

When the IME controlTarget changes from a fullscreen app to the RemoteInsetsControlTarget, the visibility from the IME input target should been reported to the controlTarget. Otherwise, they could be out of sync.

Fix: 399191474
Flag: android.view.inputmethod.refactor_insets_controller
Test: atest ImeInsetsSourceProviderTest#testUpdateControlForTarget_remoteInsetsControlTarget
Test: manual:
      Open IME on tablet in fullscreen app
      Enter desktop windowing mode while IME showing
      Verify that IME is still visible
Change-Id: I7cb5dea67c5622856a20c52434c252fd84af89b7