Actually fix gitlab issue title

lib/gitlab.js

@@ -33,7 +33,7 @@ module.exports = {
         return axios.post(
             server.issuesUrl,
             {
-                title: `${service} registration for ${body['oc-user']}`,
+                title: `${context.service} registration for ${body['oc-user']}`,
                 confidential: true,
                 description: templates.issue(context),
             },