Fix two column motif area content measuring

Ensure content probe element has correct width. Caused two column
layout to move content down even if motif fits nexts to cotnent.

This went unnoticed since storybook used v2 frontend. Switch storybook
back to v1 frontend since this what is still used in production.

REDMINE-20384

entry_types/scrolled/lib/tasks/pageflow_scrolled/storybook.rake

@@ -33,8 +33,7 @@ namespace :pageflow_scrolled do
 
         account = seeds.account(name: 'storybook-seed') do |account_in_progress|
           account_in_progress.features_configuration =
-            account_in_progress.features_configuration.merge('scrolled_entry_type' => true,
-                                                             'frontend_v2' => true)
+            account_in_progress.features_configuration.merge('scrolled_entry_type' => true)
         end
 
         seeds.sample_scrolled_entry(

entry_types/scrolled/package/src/frontend/layouts/TwoColumn.js

@@ -25,7 +25,7 @@ export function TwoColumn(props) {
     <div className={classNames(styles.root, styles[props.align],
                                narrow ? styles.narrowViewport : styles.wideViewport)}>
       <div className={classNames(styles.group)} key={props.align}>
-        <div className={styles.inline} ref={props.contentAreaRef} />
+        <div className={classNames(styles.box, styles.inline)} ref={props.contentAreaRef} />
       </div>
       {renderItems(props, narrow)}
       {renderPlaceholder(props.placeholder)}