Minor translation fixes and refactoring

Lactozillarequested to merge
Lactozilla/SRB2:remap-fixes into next
  • Separated code into a function so that behavior is more consistent between renderers
    • Fixes the Metal Sonic boss not flashing orange in the OpenGL renderer.
  • Made TC_ALLWHITE, TC_METALSONIC and TC_BOSS able to be combined with translations
  • Fixed #1412

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