Merge pull request #6612 from nextcloud/backport/6611/stable30

[stable30] fix: Use new query builder

lib/Db/BoardMapper.php

@@ -210,7 +210,7 @@ class BoardMapper extends QBMapper implements IPermissionMapper {
 		}
 
 		// shared with user
-		$qb->resetQueryParts();
+		$qb = $this->db->getQueryBuilder();
 		$qb->select('b.id', 'title', 'owner', 'color', 'archived', 'deleted_at', 'last_modified')
 			//->selectAlias('1', 'shared')
 			->from('deck_boards', 'b')