fix 'everyone' tab link
fix 'everyone' tab link

test plan:
* add a group to a course
* visit the 'People' page
* cliking on the 'Everyone' tab should not take you to
/courses/1/users

refs #CNVS-14011

Change-Id: Icc8d662d6165b6f746c623fa24e867f44c6a536c
Reviewed-on: https://gerrit.instructure.com/37488
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Matthew Wheeler <ce71fbafda91d6c8f12582e1837687d5fe592dd9@instructure.com>
QA-Review: Clare Strong <40d6bb3ed7fef516c73274131d5a837c16de74fd@instructure.com>
Product-Review: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>

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