Make email address read-only in rolodex edit form

`owner:rcross@amsl.com` `resolution_fixed` `type_defect`   |    by rcross@amsl.com

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Due to the email address being the primary key of the Email object, editing the address causes unexpected results.

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_Issue migrated from trac:2602 at 2022-03-04 06:53:10 +0000_