Cancel button does not display the previous configuration of the gadget, instead it saves the new one

Short Description: Cancel button does not display the previous configuration of the gadget, instead it saves the new one.

Steps to Reproduce:

1 - Add the Test Runs List gadget to the Dashboard
2 - Configure the gadget with a project that returns results and press "Save" button
3 - Now, edit the gadget
4 - Enter one or some new fields (it can be any of the new configuration fields) and press "Cancel" button

Actual Result: Instead of showing the previous configuration, the "Cancel" button saves the new settings and displays a new configuration.

Expected Result: The previous configuration should be shown.