D29202: Remove unused QtConcurrent from colorutils

[patrick j pereira]

patrickelectric added a comment.


  @apol done.

REVISION DETAIL
  https://phabricator.kde.org/D29202

To: patrickelectric, apol, mart
Cc: plasma-devel, fbampaloukas, GB_2, domson, dkardarakos, ngraham, apol, 
ahiemstra, davidedmundson, mart