upnp: fix regression introduced in 16.7.8

PR: https://forum.opnsense.org/index.php?topic=3976
(cherry picked from commit 8e013753)

src/etc/inc/plugins.inc.d/miniupnpd.inc

@@ -39,8 +39,8 @@ function miniupnpd_firewall($fw)
         return;
     }
 
-    $fw->registerAnchor('miniupnpd/*', 'rdr');
-    $fw->registerAnchor('miniupnpd/*', 'fw');
+    $fw->registerAnchor('miniupnpd', 'rdr');
+    $fw->registerAnchor('miniupnpd', 'fw');
 }
 
 function miniupnpd_services()