Fix screenshot test

[ZetaTom]

This change fixes screenshot tests failing because the following trace:

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.owncloud.android.datamodel.OCFile.getRemotePath()' on a null object reference

at com.owncloud.android.ui.fragment.FileDetailSharingFragment.refreshSharesFromDB(FileDetailSharingFragment.java:465)

at com.owncloud.android.ui.fragment.FileDetailSharingFragment.onActivityCreated(FileDetailSharingFragment.java:159)

at androidx.fragment.app.Fragment.performActivityCreated(Fragment.java:3156)
...

• Tests written, or not not needed

[github-actions]

Codacy

Lint

Type	master	PR
Warnings	69	69
Errors	3	3

SpotBugs

Category	Base	New
Bad practice	26	26
Correctness	73	73
Dodgy code	360	360
Experimental	2	2
Internationalization	7	7
Malicious code vulnerability	2	2
Multithreaded correctness	6	6
Performance	54	54
Security	18	18
Total	548	548

[github-actions]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/12402.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]

blue-Light-Screenshot test failed, but no output was generated. Maybe a preliminary stage failed.

[ZetaTom]

Superseded by #12474.

[github-actions]

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