Remove goto from InputDispatcher

The goto instructions inside findTouchedWindowTargetsLocked have made it
very difficult to reason about this function.
Remove the goto statements in this CL.

Bug: 211379801
Test: m inputflinger_tests && $ANDROID_HOST_OUT/nativetest64/inputflinger_tests/inputflinger_tests
Change-Id: I9d645cefe6cd8d9a9a0816f36efd7a024a0447a7