Editing a "Sprint Burndown Gadget" shows the first board in the Board dropdown instead of the last saved board.

Issue Summary

While saving the configuration of "Sprint Burndown Gadget", if we go to edit the gadget again, it shows the first board instead of the last saved gadget in Board drop down
This is reproducible on Data Center: (yes) / (no)

Steps to Reproduce

1. Add a gadget of type "Sprint Burndown Gadget"
2. Edit the gadget
3. Choose a board (preferably not the first one)
4. Save the gadget
5. Edit the gadget again

Expected Results

• It should show the last saved board

  Actual Results

It shows the first board from the dropdown as selected

Workaround

Choose the correct board and save