Auxiliary "repeatableFieldAction" property disappear while removing "vendor reference number" field mapping

See bug MODDATAIMP-520 for background.

Current workaround: Create from scratch invoice mapping profile without "vendor reference number" field mapping

Steps to Reproduce:

1. Log into hosted env
2. Go to Settings, Data import, Field mapping profiles
3. Pick to edit or duplicate "Default - EBSCO serials invoice" mapping profile
4. Fill in required fields (Batch group, Vendor name, Payment method)
5. Remove "vendor reference number" field mapping using trash icon and save changes

Expected Results: Auxiliary "repeatableFieldAction" property exists at the "invoiceLines" mapping field in the updated (or created as duplicate) mapping profile. "invoiceLines" mapping field is an element of "mappingFields" array where property "name" == "invoiceLines" (the element can be found by path $.mappingDetails.mappingFields[?(@.name=='invoiceLines')] in a mapping profile)

Actual Results: Auxiliary "repeatableFieldAction" property is absent at the "invoiceLines" mapping field in the updated (or created as duplicate) mapping profile