Let IMMS#shouldShowImeSwitcherLocked() take a user ID

As a preparation befor making IMMS#mMenuController multi-user aware,
this CL lets

  InputMethodManagerService#shouldShowImeSwitcherLocked(),

take a user ID as an input parameter.

This is a mechanical refactoring CL with no behavior change expected.

Bug: 305849394
Test: presubmit
Change-Id: I5224b2debe4243b0eeebc022c313ec35c7253665
1 file changed