plasma-polkit-agent.service: fix After, BusName keys

BUG: 431963

plasma-polkit-agent.service.in

 [Unit]
 Description=KDE PolicyKit Authentication Agent
 PartOf=graphical-session.target
+After=plasma-core.target
 	
 [Service]
 ExecStart=@KDE_INSTALL_FULL_LIBEXECDIR@/polkit-kde-authentication-agent-1
-BusName=org.kde.Polkit1AuthAgent
+BusName=org.kde.polkit-kde-authentication-agent-1
 Slice=background.slice
-After=plasma-core.target
 TimeoutSec=5sec
 Restart=on-failure