Rename InputMethodManagerServiceTestBase#mCallingUserId to mUserId

This CL mechanically renames mCallingUserId to mUserId in
InputMethodManagerServiceTestBase, as there is absolutely zero reason
to initialize it with UserHandle.getCallingUserId() in unit tests.

Bug: 352615651
Flag: TEST_ONLY
Test: atest FrameworksInputMethodSystemServerTests
Change-Id: I926888cbbc4f007a642d566156dde9e9e26ab179
4 files changed