Fix GIFT import to respect default answernumbering for new multichoice
questions (introduced in MDL-50011). Default for shuffleanswers is still
ignored, as this is a rather coarse-grained way to do it, and the wrong
setting for shuffleanswers would irreversibly alter the meaning of some
questions.
This is not an ideal long-term fix, but will save significant effort
for anyone who needs to be able to set answernumbering style for
questions imported in GIFT format.
Nick Phillips
b6efeb4730