s/TestInputListenerMatchers.h/TestEventMatchers.h

...because it contains matchers for various event types, like
NotifyMotionArgs and MotionEvent, not just for those assocated with
InputListeners.

Bug: 245989146
Test: atest inputflinger_tests
Change-Id: Ibdd75ae6dd9aef90bdf8b3280d0bc0660c60fa31