DA - fix failing spec

fixes CNVS-16185

tes plan:
 - specs pass

Change-Id: I21544421a00ea4508c38821d1f6cc5cc77854301
Reviewed-on: https://gerrit.instructure.com/42495
Reviewed-by: Mike Nomitch <mnomitch@instructure.com>
Product-Review: Bryan Madsen <bryan@instructure.com>
QA-Review: Bryan Madsen <bryan@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>

Author: cameronsutter

spec/models/broadcast_policies/quiz_submission_policy_spec.rb

@@ -94,7 +94,7 @@ def wont_send_when
       specify { wont_send_when { quiz.stubs(:deleted?).returns true } }
       specify { wont_send_when { submission.stubs(:graded_at).returns nil }}
       specify { wont_send_when { submission.stubs(:pending_review?).returns false }}
-      specify { wont_send_when { submission.stubs(:user_has_visibility).returns false }}
+      specify { wont_send_when { QuizSubmissionPolicy.any_instance.stubs(:user_has_visibility?).returns(false) }}
     end
 
 
@@ -118,7 +118,7 @@ def wont_send_when
       specify { wont_send_when { course.stubs(:available?).returns false} }
       specify { wont_send_when { quiz.stubs(:deleted?).returns true } }
       specify { wont_send_when { submission.stubs(:graded_at).returns nil }}
-      specify { wont_send_when { submission.stubs(:user_has_visibility).returns false }}
+      specify { wont_send_when { QuizSubmissionPolicy.any_instance.stubs(:user_has_visibility?).returns(false) }}
 
       specify do
         wont_send_when do