Fix order dependent test in server_test.go

[jaystenmark]

go test -shuffle=1738872331488754809 now passes

Description

Closes a dangling connection to ensure all goroutines created in test are stopped.

Reference issue

Fixes #436

[Sean-Der]

Thank you! I bet this is massively a problem in pion/webrtc

should we shuffle in CI?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.14%. Comparing base (31282d5) to head (62e6dbd).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #437      +/-   ##
==========================================
- Coverage   66.37%   66.14%   -0.23%     
==========================================
  Files          43       43              
  Lines        3084     3084              
==========================================
- Hits         2047     2040       -7     
- Misses        871      877       +6     
- Partials      166      167       +1     

Flag	Coverage Δ
go	66.14% <ø> (-0.23%)	⬇️
wasm	26.58% <ø> (ø)

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[Sean-Der]

I am going to re-open these PRs. CI was broken, and will be working on new PR.

sorry about that!