PB-108 fix static test

Author: paras89

app/code/Magento/PageBuilder/view/adminhtml/web/js/content-type/column/preview.js

@@ -334,8 +334,8 @@ export default class Preview extends PreviewCollection {
             // can happen if the column is moved within the same column group
             return;
         }
-        if (parentContentType.config.name != "column-line") {
-            //for legacy content in preview mode before stage is initialized, the parent may not be a column line
+        if (parentContentType.config.name !== "column-line") {
+            // for legacy content in preview mode before stage is initialized, the parent may not be a column line
             return;
         }
         const siblings = parentContentType.children();