[FIX] kanban: number missing in IE9

In IE9 there is a "dy" attribute of tspan svg elements which may be wrongly not
set to 0. These elements may then be lower than they should (and thus may
eventually not be seen at all if they are outside of the svg view area).

This fix adds IE9 in the range of browsers to which the "dy" must be set to 0.

This issue don't happen in the last official release (http://www.justgage.com/)
thanks to either a fix since RaphaelJS 2.0.2 or an update in justgage.

addons/web_kanban_gauge/static/lib/justgage/justgage.js

@@ -859,7 +859,7 @@ function getColor(val, pct, col, noGradient, custSec) {
 
 /** Fix Raphael display:none tspan dy attribute bug */
 function setDy(elem, fontSize, txtYpos) {
-  if ((!ie || ie > 9) && elem.node.firstChild.attributes.dy) {
+  if ((!ie || ie > 8) && elem.node.firstChild.attributes.dy) {
     elem.node.firstChild.attributes.dy.value = 0;
   }
 }