MC-843: Heading live edit should become unfocused on drag action

- Removed draggable try catch block and replaced with hasfocus validation

Author: Hwashiang Yu

app/code/Magento/PageBuilder/view/adminhtml/web/js/binding/draggable.js

@@ -13,12 +13,9 @@ import ko from "knockout";
 ko.bindingHandlers.draggable = {
     init(element, valueAccessor) {
         $(element).on("mousedown", () => {
-            try {
+            if (document.hasFocus()) {
                 (document.activeElement as HTMLElement).blur();
             }
-            catch (error) {
-                console.error(error);
-            }
         }).draggable(valueAccessor());
     },
 };