Fix: Fixed issue where delete key wouldn't work after removing item from selection

[ferrariofilippo]

Resolved / Related Issues

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• Closes Bug: Delete key doesn't work when removing one item from selection #17298

Notes
It seems the issue is caused by the checkbox, which when focused handles all Key-related events.
For some reason I don't understand, the bug affects only Deselection and not Selection
The code below removes the focus from the checkbox once its state is updated

Steps used to test these changes

Stability is a top priority for Files and all changes are required to go through testing before being merged into the repo. Please include a list of steps that you used to test this PR.

1. Open a folder with multiple files (test different layouts)
2. Select some of them
3. Deselect one clicking on the checkbox
4. Hit the Del key and see that the modal pops-up
5. Repeat 3 and 4 as many times as you wish

Selection.mp4

[yaira2]

LGTM