Ensure ext error isn't handled in the error handler

Author: ChrisLovering

bot/exts/utils/extensions.py

@@ -79,6 +79,7 @@ async def cog_command_error(self, ctx: Context, error: Exception) -> None:
         """Handle BadArgument errors locally to prevent the help command from showing."""
         if isinstance(error, commands.BadArgument):
             await ctx.send(str(error))
+            error.handled = True
             return
         logger.error(f"Unhandled error in ext cog: {error}")