Updated issue comment form backup for d.o D7 upgrade.

Finally it's back.  Just needed a minimal selector tweak.

As also stated in the existing JSDoc of the file, especially since the D7 upgrade, d.o is (completely) eating some of my comments sometimes - my browser performs a _GET redirect_ to the same page, losing all submitted POST data + even browser history, so not even the browser stores the form values in any way...

Due to that, I even started to restarted the habit of copying my comments before hitting the Save button... This good ol' behavior in Dreditor successfully protects against that weird d.o misbehavior + allows you to restore your last submitted form values from localStorage. :+1: 

Drupal infra is currently working on a CDN and related stuff, so I expect that these terrible incidents will only increase in the future.