LP1847827 - Evergreen Web Based Self Check - Use prefered first name in header.

LP1847827 - Evergreen Web Based Self Check - Use prefered first name in header.

Thank you to Suzanne Paterno for showing me what to edit.

After this is installed, just set and unset a preferred first name for an account
and make sure it shows up correctly in the web based self check interface.
https://example.com/eg/circ/selfcheck/main

Signed-off-by: Josh Stompro <stompro@stompro.org>
Signed-off-by: Jennifer Pringle <jennifer.pringle@bclibraries.coop>
Signed-off-by: Bill Erickson <berickxx@gmail.com>