Add keys for good measure in second similar part

Author: Timothée Boucher

frontend/Node.js

@@ -193,9 +193,9 @@ class Node extends React.Component {
  <span style={styles.tagText}>
  <span style={styles.openTag}>
  <span style={tagStyle}>&lt;{'' + node.get('name')}</span>
- {node.get('key') && <Props props={{'key': node.get('key')}}/>}
- {node.get('ref') && <Props props={{'ref': node.get('ref')}}/>}
- {node.get('props') && <Props props={node.get('props')}/>}
+ {node.get('key') && <Props key='key' props={{'key': node.get('key')}}/>}
+ {node.get('ref') && <Props key='ref' props={{'ref': node.get('ref')}}/>}
+ {node.get('props') && <Props key='props' props={node.get('props')}/>}
  <span style={tagStyle}>&gt;</span>
  </span>
  {collapsed && '…'}