removing tech center sequence duplicate.

there already is a more 'sophisticated' entry in map.yaml.
make allied color on desert shellmap slightly more vibrant.
bring temp shellmap allied color in line with desert shellmap/original RA.
undo change to desert shellmap allied color
changes temp shellmap allied color to same as singleplayer/desert shellmap.
Merge pull request #3345 from reaperrr/minorfixes01

Some minor fixes