switch email to main when new email added after match on agent ID with different email

This applies to: Relitix imports and all file importers

When a record is imported and matches on the agent ID/MLS but has a different email, the email gets added to the contact as an additional email but not set as the "main" email used for emailing the contact

This change would be to set the new email as the main email

When agents switch brokerages and their email changes the emails go to the old email address from their prior brokerage and bounce