Use standard Lightning Network port for LND

Only use the non-standard one internally, so we can run both c-lightning
and lnd on the same machine.

site-cookbooks/kosmos-bitcoin/templates/lnd.conf.erb

@@ -3,7 +3,7 @@ debuglevel=<%= @lnd_log_level %>
 listen=0.0.0.0:<%= @lnd_port %>
 ; rpclisten=127.0.0.1:10002
 ; restlisten=127.0.0.1:8002
-externalip=<%= @lnd_public_ip %>:<%= @lnd_port %>
+externalip=<%= @lnd_externalip %>
 alias=<%= @lnd_alias %>
 color=<%= @lnd_color %>
 maxpendingchannels=2