Remove an incorrect @UserIdInt from InputMethodUtils

This is a follow up CL to my previous CL [1], which incorrectly added

  @UserIdInt

annotation to "uid" parameter in

  InputMethodUtils#checkIfPackageBelongsToUid().

As it is a uid not userId, @UserIdInt has never been appropriate for
that parameter.

This CL must have no observable behavior change since @UserIdInt
doesn't change any runtime behavior.

 [1]: Ic33e94f2bdedaa2c573be0857727d901800e5bbf
      4792bc1d

Bug: 234882948
Test: presubmit
Change-Id: I8d6f1689c3cff80421913d64c43e242744eccf36