fix configurePath

CloudronManifest.json

@@ -10,7 +10,7 @@
   "manifestVersion": 1,
   "website": "https://wordpress.org/",
   "contactEmail": "apps@cloudron.io",
-  "configurePath": "/wp-admin",
+  "configurePath": "wp-admin/",
   "icon": "icon.png",
   "addons": {
     "mysql": {},