fix "fill in multiple blanks" question types; fixes #3912
fix "fill in multiple blanks" question types; fixes #3912

This was leftover from the removal of OpenObject from the quizzes.

Change-Id: I586c55133eefdc76f9c77d58d1bae3f339628264
Reviewed-on: https://gerrit.instructure.com/2450
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Brian Whitmer <760e7dab2836853c63805033e514668301fa9c47@instructure.com>

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