KCM look and feel : set proper default values for kwin kdecoration when applying global style
Summary: BUG: 397595
Test Plan:
KCM Look and feel, apply Breeze or Breeze Dark global style, then go to KCM KWin Decoration (Window Decoration), no decoration is highlighted in the grid.
In kwinrc, the group [org.kde.kdecoration2] has a theme= with no value.
With this patch, applying Breeze or Breeze Dark global theme will write the proper value in kwinrc and the KCM KWin Decoration will show the correct decoration highlighted.
Reviewers: ervin, bport, meven, davidedmundson, Plasma, ngraham
Reviewed By: ngraham
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D27483
(cherry picked from commit 6d3d3ffa76a5125da843fe6f58a684bdba6e6d26)