Invoke ImeRequestedChangedListener with windowToken of imeInputTarget

In case the RemoteInsetsControlTarget is the controlTarget, we did not
send the correct windowToken of the IME input target to
InputMethodManagerService, which led to isShowRequestedForCurrentWindow
returning false, even though the IME was shown.

Bug: 426075288
Test: atest CtsInputMethodTestCases
Flag: EXEMPT Bugfix
Change-Id: I8797727ab3e12df156667e876a7a4458fbc5cb56