conversations: remove broken "discussion replies" link
conversations: remove broken "discussion replies" link

fixes CNVS-11987

test plan:
  * open old conversations
  * open the view dropdown
  * verify that it does not include the "discussion replies" link

Change-Id: Iaeeaa94a62a978a4d30af251c06b51d7855ed246
Reviewed-on: https://gerrit.instructure.com/32278
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Jon Willesen <eb5ce5e6a76c243326fecfa94534101600f87bd9@instructure.com>
QA-Review: Steven Shepherd <e794458448443812fb2685675aab3bbd1a3891bc@instructure.com>
Product-Review: Braden Anderson <a6cc2cef7d25f27847876bdb81651755fcebacf0@instructure.com>

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