fix(uiCanExit): removed setTimeout wrapper of hook registration

Remove setTimeout wrapper for registerUiCanExitHook and move it to the
node ref function.
The setTimeout is preventing the hook to be registered if the state
is entered and exited synchronously.

Author: elboman

src/components/UIView.tsx

@@ -63,10 +63,13 @@ export class UIView extends Component<IProps, IState> {
     let { children } = this.props;
     let { component, props, loaded } = this.state;
     // register reference of child component
-    props.ref = c => this.componentInstance = c;
     // register new hook right after component has been rendered
     let stateName: string = this.uiViewAddress && this.uiViewAddress.context && this.uiViewAddress.context.name;
-    setTimeout(() => this.registerUiCanExitHook(stateName));    
+    props.ref = c => {
+      this.componentInstance = c;
+      this.registerUiCanExitHook(stateName);
+    };
+    
     let child = !loaded && isValidElement(children)
       ? cloneElement(children, props)
       : createElement(component, props);