[sddm-theme] Enlarge user avatar in focus
Summary: This patch makes the user avatar that is selected (in focus) larger than the other unselected/deselected avatars surrounding it (provided there is more than one user).
Reviewers: VDG, ngraham
Reviewed By: VDG, ngraham
Subscribers: davidedmundson, abetts, filipf, plasma-devel
Maniphest Tasks: T10325
Differential Revision: https://phabricator.kde.org/D19372