remove one-time migration script

bin/mongodb/user-marks.js

@@ -1,23 +0,0 @@
-let fields = ['engine', 'booster', 'troll', 'ipBan', 'reportban', 'rankban']
-let selector = [];
-let projection = {};
-for (field of fields) {
-  selector[field] = true;
-  let sel = {};
-  sel[field] = true;
-  selector.push(sel);
-  projection[field] = true;
-}
-printjson(selector);
-printjson(projection);
-
-db.user4.find({
-  $or: selector,
-  marks: {$exists: false}
-},projection).forEach(u => {
-  let marks = [];
-  for(field of fields) {
-    if (u[field]) marks.push(field.toLowerCase());
-  }
-  db.user4.update({_id:u._id},{$set:{marks:marks}});
-});