Update the D2 mod color picker presets during the OpenRA engine migration. #233

Current PresetColors were migrated from the old PresetHues / PresetSaturations values, which were copied from D2k. They are not verified against the original Dune II player/house colors.
Task:
Review and adjust ColorPickerManager.PresetColors in mods/d2/rules/world.yaml so the available player colors better match Dune II instead of inheriting D2k defaults.