Legend.draw: Add missing select('rect')

Author: n-riesco

src/components/legend/draw.js

@@ -227,7 +227,7 @@ module.exports = function draw(gd) {
             width: opts.width - 2 * opts.borderwidth + constants.scrollBarWidth
         });
 
-        clipPath.attr({
+        clipPath.select('rect').attr({
             width: opts.width + constants.scrollBarWidth
         });