test: fix flaky http2-flow-control test

PR-URL: nodejs#20556
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>

Author: apapirovski

test/parallel/test-http2-misbehaving-flow-control-paused.js

@@ -70,8 +70,6 @@ server.on('stream', (stream) => {
     client.destroy();
   }));
   stream.on('end', common.mustNotCall());
-  stream.respond();
-  stream.end('ok');
 });
 
 server.listen(0, () => {