feat(groups/{_,k,n,p}*): vim syntax support

Add vim modeline instructing the editor to use syntax plugin provided by apparmor.
Continuation of #394 to keep the diff list relatively short.

apparmor.d/groups/kde/kscreen_osd_service

@@ -17,4 +17,6 @@ profile kscreen_osd_service @{exec_path} {
   @{exec_path} mr,
 
   include if exists <local/kscreen_osd_service>
-}
+}
+
+# vim:syntax=apparmor