fix: erp user keeps the email

src/QUI/ERP/User.php

@@ -106,7 +106,7 @@ public function __construct(array $attributes)
         $this->username = $attributes['username'];
         $this->firstName = $attributes['firstname'];
         $this->lastName = $attributes['lastname'];
-
+        
         if ($attributes['country'] instanceof QUI\Countries\Country) {
             $this->country = $attributes['country']->getCode();
         } else {
@@ -214,6 +214,7 @@ public static function convertUserToErpUser(QUI\Interfaces\Users\User $User)
             'isNetto' => $User->getAttribute('quiqqer.erp.isNettoUser'),
             'data' => $data,
             'address' => $address,
+            'email' => $User->getAttribute('email'),
 
             'quiqqer.erp.euVatId' => $User->getAttribute('quiqqer.erp.euVatId'),
             'quiqqer.erp.taxId' => $User->getAttribute('quiqqer.erp.taxId')