Using SurfaceControl#remove() instead of release()

According to the Java doc, the surface may still continue to exist
on screen after calling release(), and it does in this case. Using
remove() to release the surface of magnification overlay and also
remove it from the screen.

Bug: 127431967
Test: a11y CTS & unit tests
Test: manual
Change-Id: I17d9956fefe7d5b917b7596188041eef22ebd4bd