[misc] use the domain name of the jid to browse disco instead of hostame. Do...

[misc] use the domain name of the jid to browse disco instead of hostame. Do not use the custom host. Fixes #2208

src/disco.py

@@ -455,7 +455,6 @@ _('Without a connection, you can not browse available services'))
 			self.address_comboboxentry.set_text_column(0)
 			self.latest_addresses = gajim.config.get(
 				'latest_disco_addresses').split()
-			jid = gajim.get_hostname_from_account(self.account)
 			if jid in self.latest_addresses:
 				self.latest_addresses.remove(jid)
 			self.latest_addresses.insert(0, jid)