Add data-status-by back to DetailedStatus component. Fixes #273.

app/javascript/flavours/glitch/features/status/components/detailed_status.js

@@ -99,7 +99,7 @@ export default class DetailedStatus extends ImmutablePureComponent {
     }
 
     return (
-      <div className='detailed-status'>
+      <div className='detailed-status' data-status-by={status.getIn(['account', 'acct'])}>
         <a href={status.getIn(['account', 'url'])} onClick={this.handleAccountClick} className='detailed-status__display-name'>
           <div className='detailed-status__display-avatar'><Avatar account={status.get('account')} size={48} /></div>
           <DisplayName account={status.get('account')} />