remove default case only path restoreVar

this is now done where it is actually needed

include/admin/images.inc.php

@@ -750,7 +750,6 @@ switch ($serendipity['GET']['adminAction']) {
         break;
 
     default:
-        serendipity_restoreVar($serendipity['COOKIE']['serendipity_only_path'], $serendipity['GET']['only_path']);
         $data['case_default'] = true;
         $data['showML'] = showMediaLibrary();
         break;