Test MotionEvents for InputDispatcher::verifyInputEvent

We recently added a new api, InputDispatcher::verifyInputEvent. There
are currently tests for this api for key events.
However, a motion event test is currently missing.

Add the missing test here.

Bug: 149845127
Test: atest inputflinger_tests
Change-Id: I791a789a9df4d62d4100b61611b52a98c77c4787