Remove unused binder in setImeWindowStatus calls

This removes an unused binder parameter from setImeWindowStatus calls,
which currently only pass it around through SystemUI, but doesn't
actually use the value.

The binder was previously added in [1] to allow switching to a different
IME from the SystemUI process, but switching doesn't require this binder
token anymore.

This also removes the binder from updateInputMethodTargetWindow. This
was added in [2] to match the token passing from [1], but this method
doesn't use the binder value either.

  [1]: I48ba5e2509b3aa1bfd2394f9201427fa6b93c6d3
  [2]: I54fb1faf513883a54293a756e4c9d2ae9453d778

Flag: EXEMPT refactor
Bug: 354667905
Test: atest NavigationBarTest CommandQueueTest RegisterStatusBarResultTest
Change-Id: I4c479f49f6bf28f4b5e6594226212cf3055ef541