Prevent click from being trapped in the editor field

Fixes [issue where enter stops working in editor](http://meta.discourse.org/t/enter-key-doesnt-work-when-search-window-open-repro-inside/1545) when search box is open. The other option would be to selectively stop intercepting <kbd>enter</kbd>, but closing the search box like would happen when you click elsewhere seems more intuitive.

I don't *think* that `false` is necessary anywhere else, but if for whatever reason it is it's possible to switch the composer view to explicitly return `true` after calling the controller `click()` instead.