"Add Rubric" button will reappear after rubric has been created

Changed limitToOneRubric to be true when the rubric list is outside of the main rubric area. I found
that the class raw_list seems to only be used on the the #rubrics element inside the Rubrics section.

Fixes CNVS-5135

Test Plan
=========

Places to where you can add multiple rubrics
--------------------------------------------

- /accounts/:id > Rubrics
- /courses/:id > Outcomes > Manage Rubrics

**Steps**

- Click "Add Rubric"
- Note that the "Add Rubric" button is now gone.
- Click "Create Rubric"
- The "Add Rubric" button should reappear
- you should be able to repeat the steps to add more

Places where you can only add one Rubric
----------------------------------------

- /courses/:id/assigments/:id
	- The assignment can't already have a rubric
- /courses/:id/discussion_topics/:id > (cog) > Add Rubric

**Steps**

- If a rubric is not auto created. Click "Add Rubric"
- Note that the "Add Rubric" button is now gone.
- Click "Create Rubric"
- The "Add Rubric" button should **NOT** reappear

-

Change-Id: I22c67289db19bd6f517815802a95f8cbc638a811
Reviewed-on: https://gerrit.instructure.com/37552
Reviewed-by: Cameron Sutter <csutter@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Caleb Guanzon <cguanzon@instructure.com>
Product-Review: Brad Horrocks <bhorrocks@instructure.com>