Remove redundant usages of IMMS#calledFromValidUserLocked()

Basically

  InputMethodManagerService#canInteractWithImeLocked()

is a superset of

  InputMethodManagerService#calledFromValidUserLocked().

There is no reason to check both of them.

Bug: 34886274
Bug: 237316307
Test: presubmit
Change-Id: Ic59d838a21fae977f6027955b9ad36fb5c970860