provide correct homeroomAnnouncements prop type
provide correct homeroomAnnouncements prop type

flag=none

test plan:
  - specs pass

qa risk: low

Change-Id: I369ed372188fa971db78f4b850cb14ee31c1bd31
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/274048
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Omar Soto-Fortuño <2ca100155bc0669318a7e6f3850629c7667465e1@instructure.com>
QA-Review: Omar Soto-Fortuño <2ca100155bc0669318a7e6f3850629c7667465e1@instructure.com>
Product-Review: Omar Soto-Fortuño <2ca100155bc0669318a7e6f3850629c7667465e1@instructure.com>

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