Source of mail_address report column

For GiveCampus reporting.

The standard gift-report view’s mail_address is a normalized field: it takes the saved additional-field mail_address first, then street_address, then the contribution’s legacy mail_address. Thus it can contain the Street_address answer even when no visible question is named mail_address. A form report-label column and this normalized report column can coexist. This does not prove the value is the processor-verified billing address; inspect the saved field/report alias if specific rows differ.