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/utempter

@@ -20,4 +20,6 @@ profile utempter @{exec_path} flags=(attach_disconnected) {
   /dev/ptmx rw,
 
   include if exists <local/utempter>
-}
+}
+
+# vim:syntax=apparmor