Fix monochrome icons missing stylesheets
Summary: Some icons were lacking compatibility with system color schemes and that was fixed. Nothing about the appearance of these icons was changed.
Reviewers: VDG, ngraham
Reviewed By: VDG, ngraham
Subscribers: ngraham, kde-frameworks-devel
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D15891