Draft: main/postmarketos-ui-plasma-bigscreen: fix conflict with postmarketos-base-ui-plasma

Add two fixes for the following.

https://builds.sr.ht/~postmarketos/job/1150982#task-img-1411 wrote:

(831/833) Installing postmarketos-ui-plasma-bigscreen (1-r0)
ERROR: postmarketos-ui-plasma-bigscreen-1-r0: trying to overwrite etc/xdg/QtProject/qtlogging.ini owned by postmarketos-base-ui-plasma-1-r1.
ERROR: postmarketos-ui-plasma-bigscreen-1-r0: trying to overwrite etc/xdg/kdeglobals owned by postmarketos-base-ui-plasma-1-r1.
ERROR: postmarketos-ui-plasma-bigscreen-1-r0: trying to overwrite etc/xdg/kscreenlockerrc owned by postmarketos-base-ui-plasma-1-r1.
ERROR: postmarketos-ui-plasma-bigscreen-1-r0: trying to overwrite etc/xdg/kwinrc owned by postmarketos-base-ui-plasma-1-r1.

CC: @PureTryOut

FYI: I've just removed qtlogging.ini, since it is the same file in both packages. If you prefer to keep it, feel free to just remove the commit and force push.