[1.4.0] Implement 'background' shorthand CSS property.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@663 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/AttrDef/ListStyle.php

@@ -53,6 +53,7 @@ class HTMLPurifier_AttrDef_ListStyle extends HTMLPurifier_AttrDef
                 }
                 $caught[$key] = $r;
                 $i++;
+                break;
             }
         }