bug(users): Fix email duplication

- normalizes email upon signup

[Delivers #167975800]

Author: leonardnjura

src/server/middlewares/validateBody.js

@@ -1,6 +1,10 @@
 const Joi = require('joi');
 
 module.exports = (req, res, next, schema) => {
+  if (req.body.email) {
+    const email = req.body.email;
+    req.body.email = email.toLowerCase();
+  }
   Joi.validate(req.body, schema, error => {
     if (error) {
       return res.status(400).send({ message: error.details[0].message });