Fixed bug where after updating a form, you couldn't click on items in sprint or backlog.

Problem: In the form Wrapper (form_views.js.coffee), we tie into sync:start and sync:stop events so we can prevent double submitting. syncStart -> addOpacityWrapper(), syncStop -> addOpacityWrapper(false). When user was hitting update, it was doing syncStart, but the form Controller and view were closing before sync:stop event was caught.
Solution: I added onClose method that calls syncStop. So if we close early, we remove the opacitywrapper.