Fix creation of kdeglobals if /etc/xdg/kdeglobals present
Summary:
If /etc/xdg/kdeglobals exists but ~/.config/kdeglobals
does not (like on the first start of kwin_wayland), it did not notice
changes to kdeglobals.
This lead to KWin using the wrong color scheme for the window decoration
on the first login, which also could not be changed without a session restart.
Test Plan: Cleared ~ and logged in again, title bar color is now correct.
Reviewers: Plasma, romangg
Reviewed By: Plasma, romangg
Subscribers: sitter, broulik, rikmills, kwin, plasma-devel
Tags: KWin
Differential Revision: https://phabricator.kde.org/D22238