feat(profiles-s-z): vim syntax support

Add vim modeline instructing the editor to use the syntax plugin provided by apparmor.

Continuation of #379, #380, #381, #390 to keep the diff list relatively short.

apparmor.d/profiles-s-z/steam-launch

@@ -43,4 +43,6 @@ profile steam-launch @{exec_path} {
   deny /opt/** r,
 
   include if exists <local/steam-launch>
-}
+}
+
+# vim:syntax=apparmor