IIRR_13: Fix channel creation when setting up a channel for a server that didn't have a system channel

Author: ABizzinotto

app/lib/discord/events/set_channel.rb

@@ -60,7 +60,7 @@ def listen_to_channel_select
             existing_channel.update!(name: channel.name, channel_id: channel.id)
           else
             # If the channel doesn't exist, create a new one associated with the server
-            server.channel.create!(name: channel.name, channel_id: channel.id)
+            server.create_channel!(name: channel.name, channel_id: channel.id)
           end
 
           # Respond with a confirmation message