change update_score_and_comments to wrap args

[breed]

when calling update_score_and_comments on a quiz submission, the attempt is already in self and there will be only one item in the update list.

Proposed Changes

• this change wraps the passed arguments in a unary quiz_submissions list if quiz_submissions is not one of the parameters to the call.

• legacy behavior is preserved if quiz_submissions is in the calling parameters.

Fixes #601