fix for ambigous column user_id in where clause ( Model\ResourceModel\User\Collection addFilterToMap for user_id )

Author: dorupetruc

app/code/Magento/User/Model/ResourceModel/User/Collection.php

@@ -41,5 +41,6 @@ protected function _initSelect()
             'user_role.parent_id = detail_role.role_id',
             ['role_name']
         );
+		$this->addFilterToMap('user_id', 'main_table.user_id');
     }
 }