Fix scrollbar & arrow keys in address book

You can now click the scrollbar on the address book!!
Up/Down arrows now work!!
JS error no longer thrown when using up/down and the result list isn't
open

I didn't implement keyboard nav. I just added a file to the
dependencies to make it work

Fixes CNVS-9745

Test Plan:

- Have lots of students
- Go to your inbox
- Click new message
- Click the address book icon
	- attempt to use the scrollbar
	- attempt to use up/down keys

Change-Id: I93763310abd33f4c51ba8bf79ae6d7ee7e1c0c45
Reviewed-on: https://gerrit.instructure.com/40140
Reviewed-by: Alex Boyd <aboyd@instructure.com>
Product-Review: Janelle Seegmiller <jseegmiller@instructure.com>
Reviewed-by: Matthew Wheeler <mwheeler@instructure.com>
QA-Review: Caleb Guanzon <cguanzon@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>