[irssi-conf] Make default network name consistent

Before, the name of the default network was set as "localhost",
"tildenet", "tilde.chat" and "irc". This chooses a more appropriate name
in both irssi's config and startup files: newnet

.irssi/config

@@ -1,9 +1,9 @@
 servers = (
-  { address = "irc"; chatnet = "localhost"; port = "6667"; }
+  { address = "irc"; chatnet = "newnet"; port = "6667"; }
 );
 
 chatnets = {
-  tildenet = {
+  newnet = {
     type = "IRC";
     max_kicks = "4";
     max_msgs = "5";
@@ -13,8 +13,8 @@ chatnets = {
 };
 
 channels = (
-  { name = "#club"; chatnet = "tilde.chat"; autojoin = "No"; }
-  { name = "#meta"; chatnet = "tilde.chat"; autojoin = "No"; }
+  { name = "#club"; chatnet = "newnet"; autojoin = "No"; }
+  { name = "#meta"; chatnet = "newnet"; autojoin = "No"; }
 );
 
 aliases = {

.irssi/startup

@@ -1,3 +1,3 @@
-connect irc
+connect newnet
 join #club
 join #meta