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>

koha-tmpl/intranet-tmpl/prog/en/modules/cataloguing/value_builder/marc21_leader.tt

@@ -8,7 +8,7 @@
 <h3>000 - Leader</h3>
 <table>
 	<tr>
-		<td><span class="label">1-4 Record size</span></td>
+        <td><span class="label">0-4 Record size</span></td>
 		<td>(auto-filled)</td>
 	</tr>
 	<tr>