Default field mapping for 647 field needs updating

Overview: 647 field (Subject heading-named event) had incorrect default mappings in the original spreadsheet; it needs to be updated to have correct mapping

Current workaround: Local edit of the default MARC-Instance mapping

Steps to Reproduce:

1. Log into FOLIO-snapshot as diku_admin
2. Go to Data Import and import the attached file using the Default profile
3. Go to Inventory and review the subject headings in the instance
4. You're looking for a subject heading that says: Battle of Bunker Hill (Boston, Massachusetts : 1775)

Expected Results: See row 147 of the FOLIJET Instance from MARC tab in the Recommended MARC mappings: https://docs.google.com/spreadsheets/d/11lGBiPoetHuC3u-onVVLN4Mj5KtVHqJaQe4RqCxgGzo/edit#gid=1871391984
Also see the screenshot of the current default mapping for the 647 field, from https://github.com/folio-org/mod-source-record-manager/blob/master/mod-source-record-manager-server/src/main/resources/rules/rules.json. The 647 mapping should be $acdgvxyz

Actual Results: The 647 mapping in the original spreadsheet only included $vxyz

Additional Information: See attached MARC file and screenshot