Fix syntax when use case

Author: elct9620

lib/realtime.js

@@ -618,7 +618,7 @@ function ifMayEdit(socket, callback) {
         case "freely":
             //not blocking anyone
             break;
-        case "editable": case: "limited":
+        case "editable": case "limited":
             //only login user can change
             if (!socket.request.user || !socket.request.user.logged_in)
                 mayEdit = false;