Set Minetest log level for Discord messages

Logging Discord messages is important, but they shouldn't be sent to admins while they're ingame (???)
As such, the logging level has been set to "action"

init.lua

@@ -37,7 +37,7 @@ discord.handle_response = function(response)
             if irc_enabled then
                 irc.say(msg)
             end
-            minetest.log('[Discord] Message: '..msg)
+            minetest.log('action', '[Discord] Message: '..msg)
         end
     end
     if data.commands then