Fixed Imp sprite alignment

[Blastfrog]

Due to the nature of the engine's sprite flipping, the Imp was often misaligned in many rotations, only way to fix it being to add horizontal "padding" to the image. So, that's just what I did. With this patch, the Imp will be correctly aligned when being viewed from angles 6-8.

http://www.mediafire.com/?av8zyic7ozj93z8

[hex11]

Good job! Now the imp doesn't look like he's doing the Humpty dance...

[RjY]

Thanks Sodaholic, I've pushed this out.

[fraggle]

Huh, thought I already fixed this. Good catch.

[Blastfrog]

Technically, I think that all sprites in any Doom game needs this solution. It's only more pronounced on the Freedoom imp because of it's tail.