fix(fullscreen magnification): fix test sending incorrect TouchEvents

It was adding the pointer index to the action instead of logical-or.

Additionally, you are not supposed to add the pointer index to MOVE
events. This was causing a warning from InputEventConsistencyVerifier:
`TouchEvent: Invalid action 258 for touch event.`

Bug: 319175022
Flag: N/A
Test: atest com.android.server.accessibility.magnification.FullScreenMagnificationGestureHandlerTest

Change-Id: I1ae12d1afc17d6df7d99840d654cdbddd44acea2