format adjustment.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@3093 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/resources/lib/form/checkbox.jelly

 <!--
 	<input type="checkbox"> tag that takes true/false for @checked
 -->
-<input type="checkbox" name="${attrs.name}" onclick="${attrs.onclick}" id="${attrs.id}"
+<input type="checkbox" name="${attrs.name}" value="${attrs.value}"
+       onclick="${attrs.onclick}" id="${attrs.id}"
        checked="${h.ifThenElse(attrs.checked,'true',null)}"/>
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