Update observeTarget to retain parameter passing (#2948)

If observeTarget is called from setTimeout, the original parameters to the call are lost and dotNetObj and gridClass are undefined on subsequent invocations.

Author: dpjohnston

knowledge-base/grid-autofit-columns.md

@@ -166,7 +166,7 @@ function observeTarget(dotNetObj, gridClass) {
     dotNetInstance = dotNetObj;
 
     if (!result || !window.DotNet) {
-        window.setTimeout(observeTarget, 500);
+        window.setTimeout(observeTarget, 500, dotNetObj, gridClass);
         return;
     }
     observer.observe(result, options);