Update Plasma to 5.12 (#1208)

aports/kde/breeze/APKBUILD

aports/kde/elisa/APKBUILD

aports/kde/kactivitymanagerd/APKBUILD

aports/kde/kdecoration/APKBUILD

aports/kde/kscreen/APKBUILD

aports/kde/kscreenlocker/APKBUILD

aports/kde/ksysguard/APKBUILD

aports/kde/kwin/APKBUILD

aports/kde/kwin/fix-compilation.patch

aports/kde/libkscreen/APKBUILD

aports/kde/libksysguard/APKBUILD

aports/kde/milou/APKBUILD

aports/kde/plasma-workspace/APKBUILD

aports/kde/plasma-workspace/dont-set-brightness-to-one.patch

aports/kde/polkit-kde-agent/APKBUILD

aports/kde/powerdevil/APKBUILD