fix typo breaking adding question bank questions to quizzes; fixes #4012
fix typo breaking adding question bank questions to quizzes; fixes #4012

Change-Id: Ie2f286b3c6d7fffc694c90e5988d4324408cc3d5
Reviewed-on: https://gerrit.instructure.com/2595
Reviewed-by: JT Olds <0857133ffcd232122dc51ad55bf5fcc9d60af5d3@instructure.com>
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>

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