chat: provide instance guid for quicklaunch
chat: provide instance guid for quicklaunch

fixes CNVS-9604

test plan:
  * enable minichat for a course
  * verify that minichat still works

Change-Id: I990ebfa5e389e1c19633543be54b1ad01df23799
Reviewed-on: https://gerrit.instructure.com/26628
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Joel Hough <4816dabf8db1bc6cac35b3a24cab2ff844b5b0c7@instructure.com>
QA-Review: Steven Shepherd <e794458448443812fb2685675aab3bbd1a3891bc@instructure.com>
Product-Review: Braden Anderson <a6cc2cef7d25f27847876bdb81651755fcebacf0@instructure.com>

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