MC-3477: Polish prototype and apply rearranging in preview

- Updated styling for draggable handle to have width

Author: Hwashiang Yu

app/code/Magento/PageBuilder/view/adminhtml/web/css/source/content-type/button-item/_default.less

@@ -28,7 +28,7 @@
         &.pagebuilder-content-type-active {
             .button-item-drag-handle {
                 color: @color-dark-gray0;
-                position: absolute;
+                position: relative;
 
                 &:before {
                     .abs-icon;
@@ -41,8 +41,7 @@
                     font-size: @pagebuilder-button__font-size;
                     left: -(@pagebuilder-button__font-size);
                     line-height: @pagebuilder-button__line-height;
-                    position: relative;
-                    width: 0;
+                    position: absolute;
 
                     &:active {
                         cursor: grabbing;