refactor: make the discord channel in config based on channel id instead of channel name so we can rename the channels from tonyboom to jorkboom for example, without having to modify the config

src/main/java/me/chayapak1/chomens_bot/Configuration.java

@@ -153,7 +153,7 @@ public class Configuration {
         public int port;
         public String username;
         public String serverName;
-        public String discordChannel;
+        public String discordChannelId;
         public String ircChannel;
         public boolean hidden = false;
         public boolean useCore = true;