Export is aborted when the phone is rotated

[guy-teube]

Steps to reproduce:

1. Run an export from the parameters of the app, choose a password and a directory
2. During the export, rotate the phone (it has to be allowed in the parameters of the phone)
3. Catima closes the export loading spinner, and displays the Import/export screen. No file is generated.

Expected result:
The export file should be run until the end regardless of orientation of the phone, and the export file should be generated

Reproduced with 2.26.0 version, on Android 13

[TheLastProject]

This is kind of a duplicate of #513 (it's the same issue), but I guess this specific case could be worked around by force-disabling rotation in the import/export activity to reduce the risk of accidental cancellations.

Of course #513 does still need to be fixed too.

[TheLastProject]

I implemented a workaround in d24366a by locking the orientation in the ImportExportActivity. It's hacky, but not being able to rotate the screen is less bad than the import/export failing