Issue Summary

When there are multiple Stickers on the same card, updating one Sticker via REST API request causes the data of the other Stickers to be replaced with the data from the updated Sticker (coping the Sticker ID, position and image)

Steps to Reproduce

1. Add two stickers to a card.
2. Check the Stickers IDs with the /cards/{id}/stickers endpoint
3. Using the output from above to get the sticker ID, update one using The Trello REST API
4. Get the stickers again using step #2. Both stickers that are returned are now the Sticker updated in step #3.

Expected Results

A single Sticker is updated, according to the Sticker ID provided.

Actual Results

All additional Stickers on the card get their data (ID, position, image, etc) replaced by the updated Sticker data.

Workaround

Remove the Stickers from the card and add them again with the values updated.