feat(cli): support true for CS_DISABLE_FILE_DOWNLOADS

[jsjoeio]

After some feedback, we realized it is more intuitive to disable file
downloads by setting the environment variable
CS_DISABLE_FILE_DOWNLOADS to true than 1. This commit adds support
for both.

Fixes N/A

[github-actions]

✨ code-server docs for PR #5134 is ready! It will be updated on every commit.

• Host: https://coder.com/docs/code-server/a9bdd37
• Last deploy status: success
• Commit: 8f1d6ac
• Workflow status: https://github.com/coder/code-server/actions/runs/2229021438

[codecov]

Codecov Report

Merging #5134 (a9bdd37) into main (a0b3614) will not change coverage.
The diff coverage is 100.00%.

❗ Current head a9bdd37 differs from pull request most recent head 8f1d6ac. Consider uploading reports for the commit 8f1d6ac to get more accurate results

@@           Coverage Diff           @@
##             main    #5134   +/-   ##
=======================================
  Coverage   71.75%   71.75%           
=======================================
  Files          30       30           
  Lines        1685     1685           
  Branches      375      375           
=======================================
  Hits         1209     1209           
  Misses        407      407           
  Partials       69       69           

Impacted Files	Coverage Δ
src/node/cli.ts	91.66% <100.00%> (ø)

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[github-actions]

✨ code-server dev build published to npm for PR #5134!

• Last publish status: success
• Commit: 8f1d6ac

To install in a local project, run:

npm install @coder/code-server-pr@5134

To install globally, run:

npm install -g @coder/code-server-pr@5134