fix: use proper npm casing postinstall

[jsjoeio]

No description provided.

[github-actions]

✨ code-server dev build published to npm for PR #5848!

• Last publish status: success
• Commit: 4f94798

To install in a local project, run:

npm install @coder/code-server-pr@5848

To install globally, run:

npm install -g @coder/code-server-pr@5848

[codecov]

Codecov Report

Merging #5848 (4e3b7d3) into main (83c3453) will not change coverage.
The diff coverage is n/a.

❗ Current head 4e3b7d3 differs from pull request most recent head 4f94798. Consider uploading reports for the commit 4f94798 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5848   +/-   ##
=======================================
  Coverage   74.94%   74.94%           
=======================================
  Files          30       30           
  Lines        1688     1688           
  Branches      371      371           
=======================================
  Hits         1265     1265           
  Misses        361      361           
  Partials       62       62           

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