Steps to replicate the issue (include links if applicable):

• Start an add section image task
• Click on "not sure" button
• When the "Not sure about this image? Confirm that you'd like to skip this suggestion." OOUI dialog comes up, click "Skip suggestion"

What happens?:
The browser's built-in "Are you sure you want to leave?" dialog comes up.

What should have happened instead?:
The browser should just navigate back to the task feed without asking for a (second) confirmation.

Software version (skip for WMF-hosted wikis like Wikipedia):
Tested locally on master.

Other information (browser name/version, screenshots, etc.):
Doesn't happen for "Add an image" tasks.