Admin panel to force email addresses to be lowercase to conform with firebase

server/firebase/firebase-handler.js

@@ -50,7 +50,7 @@ exports.createUser = async (req, res) => {
       `,
       {
         user: {
-          email,
+          email: email.toLowerCase(),
           authid: userRecord.uid,
           associations: {
             data: [{ shopid, authlevel, active: true }],