Fix bug with ?plugin update. (modmail-dev#3295)

Author: Jerrie-Aries

cogs/plugins.py

@@ -500,12 +500,12 @@ async def update_plugin(self, ctx, plugin_name):
  description=f"Failed to update {plugin.name}. This plugin will now be removed from your bot.",
  color=self.bot.error_color,
  )
- self.bot.config["plugins"].remove(plugin_name)
- logger.debug("Failed to update %s. Removed plugin from config.", plugin_name)
+ self.bot.config["plugins"].remove(str(plugin))
+ logger.debug("Failed to update %s. Removed plugin from config.", plugin)
  else:
- logger.debug("Updated %s.", plugin_name)
+ logger.debug("Updated %s.", plugin)
  else:
- logger.debug("Updated %s.", plugin_name)
+ logger.debug("Updated %s.", plugin)
  return await ctx.send(embed=embed)
 
  @plugins.command(name="update")