Bug 1571786 - Warning: Failed prop type: Invalid prop visibleColumns of type array supplied to FrameListItem, expected object. r=Honza

Fix expected prop type.

Differential Revision: https://phabricator.services.mozilla.com/D41046

--HG--
extra : moz-landing-system : lando

devtools/client/netmonitor/src/components/websockets/FrameListItem.js

@@ -50,7 +50,7 @@ class FrameListItem extends Component {
       isSelected: PropTypes.bool.isRequired,
       onMouseDown: PropTypes.func.isRequired,
       connector: PropTypes.object.isRequired,
-      visibleColumns: PropTypes.object.isRequired,
+      visibleColumns: PropTypes.array.isRequired,
     };
   }