Fix missing f-string marker

http2irc.py

@@ -717,7 +717,7 @@ class WebServer:
 		elif message.endswith('\n'):
 			message = message[:-1]
 		if '\r' in message or '\n' in message:
-			self.logger.info('Bad request {id(request)}: linebreaks in message')
+			self.logger.info(f'Bad request {id(request)}: linebreaks in message')
 			raise aiohttp.web.HTTPBadRequest()
 		return message