ISTWCMS-4954: Revoke permissions a role no longer has in setUwPermissions()

Prior to this commit, this method only granted permissions.

Fixes problem introduced in b9f50792.

src/UwRoles/UwRoles.php

@@ -168,6 +168,7 @@ class UwRoles {
     foreach ($remove_permissions as $permission) {
       $uw_role['object']->revokePermission($permission);
     }
+
     $uw_role['object']->save();
   }