[BUG] Gamma correction doesn't work with colored lighting

[electricbrass]

Describe the bug
Gamma correction has no effect on sectors with colored lighting.

Build that the bug occurred in
10.0.0 (release version) and g354f1

To Reproduce
adjust gamma correction level

Expected behavior
It to get brighter or dark everywhere when adjusting gamma.

Screenshots, NetDemos, & Crash Dumps

Additional context
map04 of odahorde is a good place to see this

[AlexMax]

Thanks for the report. I'm aware of the bug, but it is something that we need to take care of.

My memory from having run into the bug in the past is that it's only wrong so long as the level is loaded, and upon map load the gamma of the new lights is correct...unless the gamma is changed again. There might also be an 8 vs 32-bit discrepancy.