fix: output lost after hotswapping

[code-asher]

I think the pipe was closing the other streams when the child stream
closed so instead just write it one way.

This was making it quite difficult to debug code-server when doing live
edits in Coder.

[jsjoeio]

This is one of those intricate pieces of the codebase where I'm really happy you know what's going wrong and how to fix 😂 Thanks for doing this!

[codecov]

Codecov Report

Merging #5346 (30fb404) into main (714257b) will decrease coverage by 0.08%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #5346      +/-   ##
==========================================
- Coverage   72.47%   72.38%   -0.09%     
==========================================
  Files          30       30              
  Lines        1671     1673       +2     
  Branches      367      367              
==========================================
  Hits         1211     1211              
- Misses        397      399       +2     
  Partials       63       63              

Impacted Files	Coverage Δ
src/node/wrapper.ts	0.00% <0.00%> (ø)

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