This changes updates the unresolved toggle so that it only attempts to
save when explicitly tapped (as opposed to the value of resolved
changing on its own).
This was causing issues with comment synchronization between
gr-thread-view and diff comments, and also re-rendering the order of
comments in gr-thread-list within the dom-repeat.
This change also lets the resolved checkbox get selected via the enter
key.
Change-Id: I6065c745a0eabcf19df38f3cd6fd2c0d7e7434f3
fc18085eeb