Add UI metadata for payment_processor_id on financialTrxn

[mattwire]

Overview

This just adds metadata to the DAO so CiviCRM understands how to display the payment_processor_id field on the financial transaction. Used eg. by this extension: https://github.com/mjwconsult/civicrm-paymentedit

Before

Cannot use "addField()" to add field to UI because DAO does not contain required metadata.

After

Can use "addField()" to add field to UI because DAO does contain required metadata.

Technical Details

Comments

[civibot]

(Standard links)

• If this is your first pull-request for CiviCRM, please browse CONTRIBUTING.md for information about the development and testing processes.
• If you are reviewing this pull-request, you may wish to consult the test sites and the Review Standards (long template, short template).