Filter is lost after deleting multiple attachments

[Kirby]

Steps to reproduce

1. Go to admin.php?attachments/
2. Open menu Filter
3. Select Content type Post
4. Select a few attachments by ticking the checkbox
5. Scroll down (if necessary)
6. Click Button Delete
7. Confirm deletion

Expected Result
The filter is still active after the selected attachments have been deleted

Actual Result
No filter is active after the selected attachments have been deleted
Filter is lost after deleting multiple attachments

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