JENKINS-64403 Declare the page variable "divBasedFormLayout" globally, not only inside forms (#5075)

core/src/main/java/hudson/Functions.java

@@ -302,7 +302,7 @@ public class Functions {
          */
         context.setVariable("resURL",rootURL+getResourcePath());
         context.setVariable("imagesURL",rootURL+getResourcePath()+"/images");
-
+        context.setVariable("divBasedFormLayout", true);
         context.setVariable("userAgent", currentRequest.getHeader("User-Agent"));
         IconSet.initPageVariables(context);
     }