[sddm-theme/lock screen] Remove username shadow and show clock shadow only when unfocused
Summary: This patch removes the shadow from the usernames on the login and lock screens. It also restricts the clock shadow to just the opaque (unfocused) versions of each screen.
Reviewers: VDG, ngraham, filipf
Reviewed By: VDG, ngraham, filipf
Subscribers: filipf, plasma-devel
Maniphest Tasks: T10325
Differential Revision: https://phabricator.kde.org/D19468