When a checkbox is clicked, correctly call the handler if present.

[noahgibbs]

Description

Turns out we weren't handling checkboxes correctly - calling click, which sets the handler, rather than calling the handler.

Checklist

• [X] Run tests locally

[noahgibbs]

Oh hey, right, need to update the fixture since I changed check.rb.

[noahgibbs]

This is a small one, I'm just merging it now.