Bug 19322: Typo in UNIMARC field 140 plugin

Bug 19322: Typo in UNIMARC field 140 plugin

This patch corrects some incorrect information in the UNIMARC plugin for
tag 140. Literature code "li" should be "mystic literature."

To test you do not need a UNIMARC installation. Apply the patch and go
to Administration -> MARC frameworks and Actions -> MARC structure for
one of your frameworks.

- Edit subfields for a tag, e.g. 245. This is only for testing purposes
  so it doesn't have to be any particular tag.
- Change the options for one of the subfields, e.g. $a. Under "Other
  options (choose one), set "Plugin" to "unimarc_field_140.pl"
- Save changes.
- Open a bibliographic record for editing using the framework you
  modified.
- Click the plugin link next to the subfield you modified, e.c. 245$a.
- This should trigger the "UNIMARC field 140 builder" popup window.
- Find "Literature" and select "Mystic literature." Save.
- In the MARC editor, the field you modified should contain the value
  "li" at position 17-18.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit c72f01d9072a35753d235db26983560a4c984522)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>