Make the sidebar pretty

Summary:
Now that the events tracking works again, make sure that the padding is not all over the place in the sidebar.

Before:

{F162525912}

Reviewed By: priteshrnandgaonkar

Differential Revision: D15875758

fbshipit-source-id: a30f057c8c0dc2dc77fc40f416ff565cc6621109

src/ui/components/Panel.js

@@ -140,7 +140,7 @@ export default class Panel extends React.Component<
         collapsed={collapsed}>
         <Panel.PanelHeader
           floating={floating}
-          padded={typeof heading === 'string'}
+          padded={padded || typeof heading === 'string'}
           onClick={this.onClick}>
           <span>
             {collapsable && (