Issue Summary

Copying an Inbox card to a new position with Inbox does not keep the labels when keep labels is toggled on in Mobile. On Web, the UI doesn't show the `Keep labels` checkbox if Inbox is the destination board.

Steps to Reproduce

1. On iOS, go to Inbox
2. Open the card back for a card that has labels on it
3. Tap the `...` in the top right corner and select `Copy card`
4. In the bottom sheet that opens, select Inbox as the destination board and make sure keep labels is toggled on
5. Tap save

Expected Results

The card is copied to the new position in Inbox including the labels from the original card. The copy card POST request is succeeding, but labels is empty in the response even though the request body includes `labels` with `keepFromSource`

Actual Results

The card is copied to the new position in Inbox, but the labels are not copied

...

Workaround

Copy the card, then manually add the labels after