plugins/colorblindnesscorrection: mark as internal and remove configuration UI

Thomas Duckworthrequested to merge
tduck/kwin:internal-colorblindness into master

Part of systemsettings#39

Depends on plasma-desktop!2472 (merged) as it's being moved to the Accessibility KCM for greater… accessibility!

CCBUG: 488771

Edited by Nate Graham

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