Bug 30373: Fix unimarc authorised values

Bug 30373: Fix unimarc authorised values

1. Replace
  authorised_value: ""
with
  authorised_value:
to match what is done for marc21

2. Fix some wrong category names
-          authorised_value: 146a
+          authorised_value: unimarc_146a

-          authorised_value: 182a
+          authorised_value: unimarc_182a

-          authorised_value: 182c
+          authorised_value: unimarc_182c

3. Remove some category that have not been inserted (should we insert
them then?)
-          authorised_value: 183a
+          authorised_value:

-          authorised_value: qualif
+          authorised_value:

Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>