fix: help args

Author: lorenzo132

cogs/utility.py

@@ -109,7 +109,7 @@ async def format_cog_help(self, cog, *, no_cog=False):
         return embeds
 
     def process_help_msg(self, help_: str):
-        return help_.format(prefix=self.context.clean_prefix) if help_ else "No help message."
+        return help_.replace("{prefix}", self.context.clean_prefix) if help_ else "No help message."
 
     async def send_bot_help(self, mapping):
         embeds = []