Remove sheet animation delay

Summary: I noticed every time you open a sheet it feels laggy and unresponsive. This removes the wait time to make it immediate.

Reviewed By: passy

Differential Revision: D17684407

fbshipit-source-id: f918bf8ca3bb0ef68c3fe01991c67d50f3967d68

src/chrome/Sheet.tsx

@@ -91,7 +91,7 @@ class Sheet extends Component<Props, State> {
     return (
       <Transition
         in={Boolean(this.props.activeSheet) && this.state.isVisible}
-        timeout={300}
+        timeout={0}
         onExited={() => this.props.onHideSheet()}>
         {state => (
           <DialogContainer state={state}>