ncdu: show progress and the item count when deleting a selection

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Deleting a selection finished with "Successfully deleted all items!",
which claimed more than had happened - only the selected entries were
removed.  It now names the number of items deleted.

The screen was not redrawn until the whole selection had been deleted,
which made the UI look hung, so a progress box is drawn before each
deletion.

Fixes #9516

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