Attempt to fix LaunchAppShowImeOnStartTest

Launch an ImeStateInitializeActivity to make sure
the Ime state is expected before we run into each
test.

Bug: 227146931
Test: atest FlickerTests:LaunchAppShowImeOnStartTest --rerun-until-failure 100
Change-Id: I41028a97757d65db06b06043b42cd433a6810135