MARC-Instance mapping for 260/264 $c should omit any trailing period

Overview: period at end of Instance publication date field should be removed

Steps to Reproduce:

1. Log into FOLIO-snapshot-load as diku_admin
2. Go to Data Import
3. Load the attached MARC file (305080075.mrc) using the secret button
4. Once loaded, go to Inventory and search for the title: Bloomsbury bauman reader
5. View the publication date field of the Instance

Expected Results: There should not be a period at the end of 2016

Actual Results: There is

Additional Information: See attached screenshots. Please confirm that these are the punctuation rules we're using for mapping from 260/264 $c to Inventory Instance publication date field:

Punctuation for 260/264 $c mapping:

• Remove the period (.) at the end of the subfield, if there is one
• Do not remove a dash or close bracket (]) at the end of the subfield, if there is one.
• Do not remove any punctuation within the individual subfields except at the end of the subfields

Examples:
MARC 260 or 264 $c 2016.
Instance date: 2016

MARC 260 or 264 $c [2016]
Instance date: [2016]

MARC 260 or 264 $c [2016], c2015.
Instance date: [2016], c2015

MARC 260 or 264 $c 2016-
Instance date: 2016-

MARC 260 or 264 $c 2016-2018.
Instance date: 2016-2018

MARC 260 or 264 $c [2016?]
Instance date: [2016?]