fix(media proxy): fix 304 response code with body error

was accidently sending a 304 with body. introduced in c53c88d

src/pages/api/media_proxy.ts

@@ -60,7 +60,7 @@ export default async function handler(req: NextApiRequest, res: NextApiResponse)
 
     if (cachedMedia) {
       res.setHeader('x-cached', 'true');
-      res.status(304).send(cachedMedia);
+      res.send(cachedMedia);
       return;
     }