Remove JSF example

I don't think we need this: there are lots of possible XSS vectors; we don't need to enumerate every one in the qhelp file.

java/ql/src/Security/CWE/CWE-079/JsfXSS.java

@@ -1,33 +0,0 @@
-@FacesRenderer(componentFamily = "", rendererType = "")
-public class JsfXSS extends Renderer
-{
-    @Override
-    public void encodeBegin(FacesContext facesContext, UIComponent component) throws IOException
-    {
-        super.encodeBegin(facesContext, component);
-
-        Map<String, String> requestParameters = facesContext.getExternalContext().getRequestParameterMap();
-        String windowId = requestParameters.get("window_id");
-
-        ResponseWriter writer = facesContext.getResponseWriter();
-        writer.write("<script type=\"text/javascript\">");
-        writer.write("(function(){");
-        {
-            // BAD: directly output user input.
-            writer.write("dswh.init('" + windowId + "','"
-                + "......" + "',"
-                + -1 + ",{");
-        }
-        {
-            // GOOD: use the method `writeText` that performs escaping appropriate for the markup language being rendered.
-            writer.write("dswh.init('");
-            writer.writeText(windowId, null);
-            writer.write("','"
-                    + "......" + "',"
-                    + -1 + ",{");
-        }
-        writer.write("});");
-        writer.write("})();");
-        writer.write("</script>");
-    }
-}