Inline IMMS#isSelectedMethodBoundLocked()

With this commit we avoid redundant invocations of

  IMMS#mUserDataRepository.getOrCreate(mCurrentUserId)

from

  InputMethodManagerService#startInputUncheckedLocked()

by recursively inlining

  InputMethodManagerService#isSelectedMethodBoundLocked().

This is a mechanical optimization. There must be no observable
behavior change.

Bug: 325515685
Test: presubmit
Change-Id: I25e2d1735824fa2ce91ed2cfe71b21653c950bf5