Fix comments loading and screenshot test

[ZetaTom]

This pull request serves two purposes. First, it fixes the never ending loading screen when accessing the comments tab of any given file. Secondly, it introduces a check, whose absence lead to the FileDetailFragmentStaticServerIT test failing.

---

• Tests written, or not not needed

[ZetaTom]

@tobiasKaminsky, please check that all tests work as expected and add new ones if necessary.

[joshtrichards]

Fixes #12364

[JonasMayerDev]

In my brief testing, the issue seems solved.

[tobiasKaminsky]

/backport to stable-3.28

[github-actions]

Codacy

Lint

Type	master	PR
Warnings	69	69
Errors	3	3

SpotBugs

Category	Base	New
Bad practice	68	68
Correctness	73	73
Dodgy code	357	357
Experimental	2	2
Internationalization	7	7
Malicious code vulnerability	2	2
Multithreaded correctness	6	6
Performance	56	56
Security	18	18
Total	589	589

[github-actions]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/12474.apk



To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.

[github-actions]

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