Always propagate userId to InputMethodMenuController

This is a mechanical change to get rid of

  InputMethodManagerService#getCurrentImeUserIdLocked()

by always propagating userId from

  InputMethodManagerService

to

  InputMethodMenuController.

There must be no observable behavior change.

Bug: 350386877
Test: manually tested with IME switcher
Flag: EXEMPT refactor
Change-Id: I158f39edf0b8bc50824fd4c1440bf20db6f698e7