MAPG-142 modify UserPasswordResetterRepository to return only one resetter for user

(it is not possible for an user to have multiple)

src/Controller/UserController.php

@@ -196,7 +196,8 @@ class UserController implements ISecured
             $this->pdm->deleteFromDb($userConfirmation);
         }
 
-        foreach ($this->userPasswordResetterRepository->getByUser($user) as $userPasswordResetter) {
+        $userPasswordResetter = $this->userPasswordResetterRepository->getByUser($user);
+        if ($userPasswordResetter !== null) {
             $this->pdm->deleteFromDb($userPasswordResetter);
         }