update "Add TA's" link to point to new people page
update "Add TA's" link to point to new people page

test:
* create a new course
* confirm that the "Add TA's" link in the wizard points
to the new people page

fixes #CNVS-7500

Change-Id: I85f7b7975c086a6c5473204f218547c06b0a4b57
Reviewed-on: https://gerrit.instructure.com/23232
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>
QA-Review: August Thornton <9adc7a1161ddf32ff608de792a7e50179545f026@instructure.com>
Product-Review: Bracken Mosbacker <48b846001bca4166dc3fb7711563afc17525921e@instructure.com>

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