Fixed: Coldwhite/Warmwhite channels were inverted, back to RGBCW

[s-hadinger]

Description:

Since #5702 Coldwhite and Warmwhite channels were inverted. Now channels are back to RBBCW (and not RGBWC)

**Related issue (if applicable): #5761

Checklist:

• The pull request is done against the latest dev branch
• Only relevant files were touched (Also remember to update changelog.ino file)
• Only one feature/fix was added per PR.
• The code change is tested and works.
• The code change pass travis tests. Your PR cannot be merged unless tests pass
• I accept the CLA.