plasma-workspace backport request

[Nate Graham]

Hello faithful distro packagers!

Those of you who have shipped Plasma 5.19.5 and Frameworks 5.74 may want 
to cherry-pick 
https://invent.kde.org/plasma/plasma-workspace/-/commit/9a8fc811282e303ec2f93c978228a85961dae263 
into your plasma-workspace package.

This commit fixes an issue with the login button on the lock and login 
screens being too small following a Frameworks change. The buttons were 
sized incorrectly before, but it worked anyway due to another bug in 
plasma-framework which just got fixed in 5.74.


Nate