Bug 10326: bulkmarcimport.pl doesn't restore value of CataloguingLog syspref

Bug 10326: bulkmarcimport.pl doesn't restore value of CataloguingLog syspref

To test:

0) Don't apply the patch yet.
1) Have the CataloguingLog system preference set to 'Log'.
2) Import a file of bibliographic records with bulkmarcimport.pl.
3) Check the state of CataloguingLog system preference -- it will be
   set to 'Don't log'.
4) Apply the patch.
5) Repeat steps 1-3.  The CataloguingLog system preference
   will be 'Log'.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>