Always show playback controls, take 2

Now instead of increasing the player size, it decreases the video size within the player.

This has the unfortunate side effect of making the entire player less wide in order to preserve the correct aspect ratio, but it's the only way to properly do it while keeping the player height the same. I think it's a reasonable trade-off, especially considering the option is off by default. Although it may cause some user confusion. Suggestions welcome.