Bind only once to object titles

When saving a dashboard/search/visulization, as you type the new title, it modifies the current title (as well as the HTML document title) in real-time, which makes for a funky-feeling behavior.

This change modifies this behavior so that these are only bound once. (When you save an object, the page refreshes, so the values bind once again.)

Closes #1974.
Apparently you can move bindonce here - my vote is to do so, for consistency.