Invoice field mapping: Exchange rate checkbox is not being saved

Overview:  When the checkbox for "Use set exchange rate" is checked, it is not saved.

Current workaround: None

Steps to Reproduce:

1. Log into FOLIO-snapshot-load as diku_admin
2. Go to Settings/Data import/Field mapping profile
3. Create a new field mapping profile for incoming record type = EDIFACT, FOLIO record type = Invoice
4. Find the check box for Use set exchange rate and check it
5. Save the profile
6. View the "Set exchange rate" checkbox on the view screen
7. Edit the newly-saved profile, and check the Use set exchange rate checkbox

Expected Results: When the Use set exchange rate field is checked, it activates the Set exchange rate field to be editable. And when the Use set exchange rate field is checked, it stays checked

Actual Results: The Use set exchange rate field can be checked on the create/edit screen, but it's not saved. When the record is re-displayed in edit mode, it is not checked.

Additional Information: This is the same problem that we had with the Lock total checkbox on UIDATIMP-857

Additional Information: See attached video