Removed the "fastblur" path
Summary:
Since the new blur is more efficient "fastblur" or "simpleblur" is not needed anymore for fullscreen blur.
Even my old low-end laptop from 2009 (with Intel T3300) can easily do fullscreen blur now with the new method without any hitch at all.
Reviewers: graesslin, KWin, Plasma, VDG, fredrik
Reviewed By: VDG, fredrik
Subscribers: avaragic, fredrik, ngraham, plasma-devel, kwin, KWin
Tags: KWin
Differential Revision: https://phabricator.kde.org/D10181