update undelete poller to poll for undeletions, not deletions #4397
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What does this change?
Roughly the same as #4389, but for the undelete button (since each are in different implementation files).
How should a reviewer test this change?
Upload an image, delete it and then undelete it. Before this PR, there should be ongoing polling looking for the file to have been deleted (but since deletions are implemented using soft-deleted-metadata, and this button is for making an image be not deleted, it cannot ever resolve).
How can success be measured?
Less unnecessary requests from client.
Who should look at this?
Tested? Documented?