Fix: allow text copy in pngx pdf viewer

[shamoon]

Proposed change

I dont understand why we didnt have this issue previously since we were setting the render text mode but I dont think we ever wanted that, let it use the defaults instead.

To clarify Im almost certain the user in the linked thread is only having this in the browser PDF viewer because he's loading it after visiting the doc details page with our viewer first, which sets a global variable that gets picked up by PDFJS (which again, browser PDF viewers almost all use). Edit: confirmed its just the pngx viewer as suspected

I created a feature image, but here's video:

4936.mov

Fixes #4936

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please explain):

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have included testing coverage for new code in this PR, for backend and / or front-end changes.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[github-actions]

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