Make detailed-status__wrapper actually wrap detailed status (#8547)

* Remove class from scrollable div

.detailed-status__wrapper does not actually wrap the detailed status here

* Re-add class to focusable div

.detailed-status__wrapper now wraps the detailed status instead of the entire scrollable area

app/javascript/mastodon/features/status/index.js

@@ -428,11 +428,11 @@ class Status extends ImmutablePureComponent {
         />
 
         <ScrollContainer scrollKey='thread' shouldUpdateScroll={shouldUpdateScroll}>
-          <div className={classNames('scrollable', 'detailed-status__wrapper', { fullscreen })} ref={this.setRef}>
+          <div className={classNames('scrollable', { fullscreen })} ref={this.setRef}>
             {ancestors}
 
             <HotKeys handlers={handlers}>
-              <div className='focusable' tabIndex='0' aria-label={textForScreenReader(intl, status, false, !status.get('hidden'))}>
+              <div className={classNames('focusable', 'detailed-status__wrapper')} tabIndex='0' aria-label={textForScreenReader(intl, status, false, !status.get('hidden'))}>
                 <DetailedStatus
                   status={status}
                   onOpenVideo={this.handleOpenVideo}