Currently, when saving a roster in Draft Mode, we're deleting all existing entries for a team and re-inserting the new ones. This should be changed as follows:
For as many new roster entries as there are existing ones we should update them.
If there are more new entries than existing ones, they should just be inserted.
If there are fewer new entries than existing ones, the existing ones can be deleted.
Currently, when saving a roster in Draft Mode, we're deleting all existing entries for a team and re-inserting the new ones. This should be changed as follows: