Fix flaky test by ignoring error in stream close

[MarcoPolo]

This test was introduced in #323. Sometimes closing the stream will error with:

sending reset packet in non-established state: state=Closed

I think it's okay to ignore this error as it's not related to the test.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.43%. Comparing base (3e97adc) to head (7432455).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #330   +/-   ##
=======================================
  Coverage   81.43%   81.43%           
=======================================
  Files          49       49           
  Lines        4218     4218           
=======================================
  Hits         3435     3435           
  Misses        641      641           
  Partials      142      142           

Flag	Coverage Δ
go	81.43% <ø> (ø)
wasm	66.99% <ø> (ø)

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[sukunrt]

We should allow closing a stream twice. It should just be a no op.

[MarcoPolo]

Agreed. This will fix the flaky test before we make that change