Change Term reference on Student Academic Record to Session reference for model consistency

In the data model changes for Data Standard 3.0, Term was significantly retired as a data model concept, in favor of having a more generic Session entity and NOT trying to support a two-level concept of both Terms and Sessions (we found that the understandings of these concepts were not consistent, so we opted for a single class to identify instructional durations framed by dates).

However, the Term reference on Student Academic Record was missed as part of this change. That reference should be to a Session.