don't force a due date for any quiz that has lock or unlock dates
don't force a due date for any quiz that has lock or unlock dates

fixes #4481

Change-Id: I9cbcb618d260be0cf1f06d57249bbca6c54d7e64
Reviewed-on: https://gerrit.instructure.com/3474
Reviewed-by: Brian Whitmer <760e7dab2836853c63805033e514668301fa9c47@instructure.com>
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>

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