Try to fix SQL injections

back/src/controllers/administrateur.controller.js

@@ -32,7 +32,7 @@ function addNewAdministrateur(req, res) {
   var con = mysql.createConnection(dbConfig);
   var query = "INSERT INTO `Admin` (`login`) VALUES (??);";
   var inserts = [req.body.login];
-  var completeQuery = sql.preparer(mysql, query, inserts);
+  var completeQuery = mysql.format(query, inserts);
   con.connect();
   con.query(completeQuery, (err, result) => {
     if (err) {