Improve the look of the Emoticons KCM UI
Summary:
Apply the KDE HIG, make buttons consistent and make the KCM look better.
Test Plan: Open the Emoticons KCM.
Reviewers: Plasma, VDG, ngraham
Reviewed By: VDG, ngraham
Subscribers: ngraham, VDG, plasma-devel, Plasma
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D19093