Fixed: Improve ViewHandler interface : missing screens in context (OF…

…BIZ-13179)

After refactoring view handler to secure the context, the screenRenderer is missing for Screen Fop.

This is problematic if you want include some other screen on your fop template like :

${screens.render("component://mycompo/widget/MysScreens#IncludedScreen")}

Thanks Leila Mekika that detect this regression

framework/widget/src/main/java/org/apache/ofbiz/widget/renderer/fo/ScreenFopViewHandler.java

@@ -108,6 +108,7 @@ public void render(String name, String page, String info, String contentType, St
             // this is the object used to render forms from their definitions
             screens.getContext().put("formStringRenderer", formStringRenderer);
             screens.getContext().put("simpleEncoder", UtilCodec.getEncoder(modelTheme.getEncoder(getName())));
+            screens.getContext().put("screens", screens);
             screens.render(page);
         } catch (IOException | GeneralException | SAXException | ParserConfigurationException | TemplateException e) {
             renderError("Problems with the response writer/output stream", e, "[Not Yet Rendered]", request, response, context);