UnreachableParent: Don't stop recursion at unreachable redundancy groups

Author: nilmerg

library/Icingadb/Model/UnreachableParent.php

@@ -154,7 +154,7 @@ private static function selectNodes(Connection $db, Model $root): Select
             ]);
         $nodeQuery->filter(Filter::any(
             Filter::equal('dependency.state.failed', 'y'),
-            Filter::equal('to.redundancy_group.state.failed', 'y')
+            Filter::equal('to.redundancy_group.state.is_reachable', 'n')
         ));
 
         $nodeSelect = $nodeQuery->assembleSelect();