Update bot.py to load cogs.plugin after cogs.utility

This was done to allow plugins overriding the utility cog commands. Experimental change.

bot.py

@@ -76,7 +76,7 @@ def __init__(self):
         self.session = None
         self._api = None
         self.formatter = SafeFormatter()
-        self.loaded_cogs = ["cogs.modmail", "cogs.plugins", "cogs.utility"]
+        self.loaded_cogs = ["cogs.modmail", "cogs.utility", "cogs.plugins"]
         self._connected = None
         self.start_time = discord.utils.utcnow()
         self._started = False