appstream: Address some problems
- Instead of using the kcm to signify kde connect, just call it kde org.kde.kdeconnect. org.kde.kdeconnect.kcm.desktop didn't exist anyway.
- Specify launchables for optimal integration in software centers.
- Specify which dbus service it's offering, in case it ever is necessary.
- Specify the oars, stating there's no offensive content of any kind offered through KDE Connect.
CC @aacid @ltoscano, it's a file getting renamed, the translations should still apply.