Fixed sticky issue in admin grid

Author: konarshankar07

app/code/Magento/Ui/view/base/web/js/grid/toolbar.js

@@ -271,7 +271,9 @@ define([
          */
         show: function () {
             this.visible = true;
-
+            if($('.page-main-actions').length === 0) {
+                this.$sticky.style.top = 0;
+            }
             this.$sticky.style.display = '';
             this.$toolbar.style.visibility = 'hidden';