use testnet4 as a separate network

electrum/plugins/joinmarket/jm_conf.py

@@ -196,8 +196,6 @@ class JMConf:
             return constants.net.NET_NAME
         elif constants.net.NET_NAME == 'regtest':
             return 'testnet'
-        elif constants.net.NET_NAME == 'testnet4':
-            return 'testnet'
         else:
             return constants.net.NET_NAME
 

electrum/plugins/joinmarket/jmdaemon/irc.py

@@ -46,6 +46,8 @@ def get_config_irc_channel(chan_name, btcnet):
     channel = "#" + chan_name
     if btcnet == "testnet":
         channel += "-test"
+    elif btcnet == "testnet4":
+        channel += "-test4"
     elif btcnet == "signet":
         channel += "-sig"
     return channel