fix(workflowengine): GROUP BY alias not cast expression (SQL)

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

Author: susnux

apps/workflowengine/lib/Manager.php

@@ -128,7 +128,7 @@ public function getAllConfiguredEvents(): array {
 			->selectAlias($query->expr()->castColumn('events', IQueryBuilder::PARAM_STR), 'events')
 			->from('flow_operations')
 			->where($query->expr()->neq('events', $query->createNamedParameter('[]'), IQueryBuilder::PARAM_STR))
-			->groupBy('class', 'entity', $query->expr()->castColumn('events', IQueryBuilder::PARAM_STR));
+			->groupBy('class', 'entity', 'events');
 
 		$result = $query->executeQuery();
 		$operations = [];