Bug 10265: Keep punctuation for 8xx series added entry fields (MARC21)

Bug 10265: Keep punctuation for 8xx series added entry fields (MARC21)

At the moment the punctuation entered for $n $p and is
removed in the part template, which leads to displaying the subfields
without any punctuation and spaces in between.

To test:
- Catalog records with various combinations of 8xx series added
  entry fields. Subfield a, t, n, p and v are the most important.
- Verify the display in OPAC and staff is not great.
- Apply the patch.
- Verify the display in OPAC and staff is improved.

For examples see:
https://www.loc.gov/marc/bibliographic/bd80x83x.html

Important note: At the moment 8xx series added entry fields will only display, when
there is also a 490 ind. 1 = 1 field present.

Signed-off-by: Hayley Pelham <hayleypelham@catalyst.net.nz>
Signed-off-by: Joonas Kylmälä <joonas.kylmala@iki.fi>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>