TOLTECS: Remove unnecessary calls to quitGame()

Calling quitGame() simply creates a new quit event. There's no
need to do that when catching a quit event.
TOLTECS: Make aborting movies more reliable

Before, the main updateInput() might swallow attempts at aborting
movies. Now all events are handled by the movie player's own
handleInput(). As a side effect, it's no longer necessary to check
if a movie is playing before removing subtitles when pressing space.