Revert "Change method visibility for re-use"

This reverts commit 9fa3dc94.

lib/SimpleSAML/Metadata/MetaDataStorageHandlerFlatFile.php

@@ -125,7 +125,7 @@ class MetaDataStorageHandlerFlatFile extends MetaDataStorageSource
     }
 
 
-    public function generateDynamicHostedEntityID($set)
+    private function generateDynamicHostedEntityID($set)
     {
         // get the configuration
         $baseurl = \SimpleSAML\Utils\HTTP::getBaseURL();