GNOME security, bug fix, and enhancement update

accountsservice 0.6.50-7 - version bump to prevent future update path introduced by RHBA-2019:45836 Resolves: 1721562 colord 1.3.4-2 - Downgrade a trivial warning to a debug statement - Resolves: 1421231 control-center 3.28.1-6 - Calculate better extents for the configured displays arrangement...