Fix flawed statement

Author: Taaku18

core/thread.py

@@ -51,7 +51,7 @@ async def close(self, *, closer, after=0, silent=False, delete_channel=True, mes
             self.close_task.cancel()
 
         if after > 0:
-            self.close_task = self.bot.loop.call_later(after, self._close_after, silent, delete_channel, message)
+            self.close_task = self.bot.loop.call_later(after, self._close_after, closer, silent, delete_channel, message)
             return
 
         return await self._close(closer, silent, delete_channel, message)