fix copying of quiz questions imported from question banks

test plan:
* create a course with a question bank
* add a question to the bank
* create a quiz
* import the question from the bank into the quiz
* copy the course
* the copied course should have a question bank
 matching the original name with the question

fixes #CNVS-14495

Change-Id: I8e56c5c59e88be5213a004d276aadd14b89ca0cd
Reviewed-on: https://gerrit.instructure.com/38610
QA-Review: Trevor deHaan <tdehaan@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jon Willesen <jonw@instructure.com>
Product-Review: James Williams  <jamesw@instructure.com>