Show compiled JS based on query params only

[JordanMartinez]

Description of the change

I noticed that using the view=output&js=true query params (e.g. https://try.purescript.org/?view=output&js=true) don't show the compiled JavaScript but rather shows a loading screen for forever. This is annoying because I can't just show others what PureScript's output looks like when they're curious.

This fixes that.

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Checklist:

• Added the change to the changelog's "Unreleased" section with a reference to this PR (e.g. "- Made a change (#0 by @)")
• Linked any existing issues or proposals that this pull request should close
• Updated or added relevant documentation
• Added a test for the contribution (if applicable)