update module item title after ajax request

fixes #CNVS-12636

If you go to the modules page with draft state enabled and update the
title of a module item, when you hover over that text the title doesn't
update. It should.

Test Plan
As a user that can edit a module item
Given draft state is enabled
Given you have a module with module items in it
When you go to the modules page
And you edit a module items title
And you hover over the module item's title with your mouse
Then you should see the title correctly updates without having to
refresh the page.
And you should feel happy inside.

Change-Id: Ic3a90f09d8af430cbb3c751aa4770f6018b0d169
Reviewed-on: https://gerrit.instructure.com/34747
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Hilary Scharton <hilary@instructure.com>
QA-Review: Nathan Rogowski <nathan@instructure.com>
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>