[SonataUserBundle] fixed validation groups admin -> Profile

Bug fix: yes
Feature addition: no
Backwards compatibility break: no
Symfony2 tests pass: yes
Fixes the following tickets: -
Todo: -

Admin/Entity/UserAdmin.php

@@ -22,7 +22,7 @@ use FOS\UserBundle\Model\UserManagerInterface;
 class UserAdmin extends Admin
 {
     protected $formOptions = array(
-        'validation_groups' => 'admin'
+        'validation_groups' => 'Profile'
     );
 
     protected function configureListFields(ListMapper $listMapper)
@@ -88,4 +88,4 @@ class UserAdmin extends Admin
     {
         return $this->userManager;
     }
-}
+}