Bug 15396: fix MARC21 Leader plugin label '1-4 Record size'

 Bug 15396: fix MARC21 Leader plugin label '1-4 Record size'

The plugin label says "1-4 Record size", but it's actually 0-4.

http://www.loc.gov/marc/bibliographic/bdleader.html

Test plan:
-apply patch
-in cataloging, open a record in a framework that uses the plugin
-open LEADER/000 and check that the label says "0-4 Record size" now

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Good catch, fixed tab, no errors.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>