fix(dropdownfield): wrong var in where

Signed-off-by: Thierry Bugier <[email protected]>

Author: btry

inc/fields/dropdownfield.class.php

@@ -489,7 +489,7 @@ private function getMyGroups($userID) {
             ],
          ],
          'WHERE' => [
-            $groupUser . '.id' => $userID,
+            $groupUserTable . '.id' => $userID,
          ] + $dbUtil->getEntitiesRestrictCriteria(
             $groupTable,
             '',