removed v4 autoupdate URL

it isn't reachable from the nodes anyway

site.conf

@@ -59,7 +59,7 @@
 		branches => {
 			stable => {
 				name => 'stable',
-				mirrors => ['http://[fdca:ffee:ff12:42::42]/stable','http://10.132.0.50/stable','http://firmware.paderborn.freifunk.net/stable'],
+				mirrors => ['http://[fdca:ffee:ff12:42::42]/stable','http://firmware.paderborn.freifunk.net/stable'],
 				probability => 0.08,
 				good_signatures => 2,
 				pubkeys => [
@@ -69,7 +69,7 @@
 			},
 			testing => {
 				name => 'testing',
-				mirrors => ['http://[fdca:ffee:ff12:42::42]/testing','http://10.132.0.50/testing','http://firmware.paderborn.freifunk.net/testing'],
+				mirrors => ['http://[fdca:ffee:ff12:42::42]/testing','http://firmware.paderborn.freifunk.net/testing'],
 				probability => 0.25,
 				good_signatures => 1,
 				pubkeys => [