[sddm-theme/lock screen] Overhaul font sizes
Summary:
This patch:
- tells the login screen to modify the font size specified in theme.conf and the lock screen to modify the user's default theme's font size instead
- makes sure that the login screen session and keyboard buttons take this new approach too
- raises the font size of "Start New Session" on the lock screen (to match the rest)
- raises the artist/track font sizes (to match the password field)
Test Plan:
This patch resolves the problem of
(1) The fonts on the login screen and
(2) the fonts on the lock screen
not having matching sizes.
Reviewers: VDG, Plasma, ngraham, filipf
Reviewed By: VDG, ngraham, filipf
Subscribers: davidedmundson, plasma-devel
Tags: Plasma
Maniphest Tasks: T10325
Differential Revision: https://phabricator.kde.org/D19631