Fix that opacity slider

Tom

2014-11-13 11e5e5d409e6c80617b3569199e404c8e4e44e06

 src/main/java/com/gitblit/wicket/pages/ImageDiffHandler.java

@@ -80,8 +80,9 @@
            resizeable.appendElement("img").attr("class", "imgdiff-left").attr("id", id).attr("style", "max-width:640px;").attr("src", oldUrl);
            container.appendElement("img").attr("class", "imgdiff").attr("style", "max-width:640px;").attr("src", newUrl);
            builder.root().appendElement("br");
            Element slider = builder.root().appendElement("div").attr("class", "imgdiff-slider").attr("id", "slider-" + id);
            slider.appendElement("div").attr("class", "imgdiff-slider-inner");
            Element slider = builder.root().appendElement("div").attr("class", "imgdiff-slider");
            slider.appendElement("div").attr("class", "imgdiff-slider-resizeable").attr("id", "slider-" + id)
               .appendElement("div").attr("class", "imgdiff-slider-left");
            return builder.toString();
         }
         break;