update-keys: (re-)enable web of trust

We need web of trust to download the master key signatures...
So enable it.

update-keys

@@ -17,6 +17,7 @@ no-tty
 no-permission-warning
 export-options no-export-attributes,export-clean
 keyserver ${KEYSERVER}
+keyserver-options no-self-sigs-only
 armor
 no-emit-version
 __EOF__