SCI: KQ7: Force game to default to full-size movies

[angstsmurf]

KQ7 defaults movie playback to half-size. This isn't a huge problem - actually the low quality and resolution make the intro movie look better in half-size. But still, some players are likely to prefer full size, and it is a little annoying that the only way to watch the intro movie that way in ScummVM is to start a game, change the Movie size settings to full, quit back to the in-game main menu and then select Watch intro. I'm not sure what the ideal solution here is, but it might be to add movie size as a game setting in the ScummVM launcher.