MarkerTimeline set fixed decimals

Summary:
Set a fixed number of decimals for the 'ms'.
More doesn't give more insights and it messes with the overall layout.

Reviewed By: antonk52

Differential Revision: D43872203

fbshipit-source-id: 343278923ee27dbf884af41c997457bfba337ba8

desktop/flipper-plugin/src/ui/MarkerTimeline.tsx

@@ -230,7 +230,7 @@ export class MarkerTimeline extends Component<Props, State> {
               number={
                 p.markerNames.length > 1 ? p.markerNames.length : undefined
               }>
-              <Time>{p.timestamp}ms</Time>{' '}
+              <Time>{p.timestamp.toFixed(5)}ms</Time>{' '}
               <Code code>{p.markerNames.join(', ')}</Code>
             </Point>
           );