MC-5403: Edit With Page Builder Button Is Slow Opening Page Builder And No Loading Indicator After 1st Load

- Fix LESS static failure

Author: davemacaulay

app/code/Magento/PageBuilder/view/adminhtml/web/css/source/_page-builder.less

@@ -69,11 +69,11 @@
         }
 
         .pagebuilder-panel-wrapper {
-            top: 0;
             bottom: 0;
             position: fixed;
             position: -webkit-sticky;
             position: sticky;
+            top: 0;
             z-index: 102;
 
             .pagebuilder-panel {