dev/core#4732 - ScheduleReminder - Fix form to handle serialized values

[colemanw]

Overview

Fixes bug described in dev/core#4732

Technical Details

dc74206 introduced the CRM_Admin_Form::$retrieveMethod variable specifically for use on this form, but somehow got omitted from the final commit. This adds it back.

[civibot]

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[civibot]

The issue associated with the Pull Request can be viewed at https://lab.civicrm.org/dev/core/-/issues/4732

[seamuslee001]

Jenkins re test this please

[eileenmcnaughton]

test this please

[eileenmcnaughton]

test this please

[eileenmcnaughton]

unrelated fail