Fixes door buttons being too dark making people think they're unpowered: I readded the orangey bits to all button sprites except 'broken' and 'panel open'.
Changing the nuke sprites a bit: I removed the yellow pixels that were added on top of it and brighten the red and green lights a little.
Merge pull request #6384 from phil235/ButtonSpriteFix

Fixes door/shutter buttons being too dark