small test fix

integration/remx/remx.test.js

   it('support for static members in connected components', () => {
     expect(MyConnectedComponent.options).toEqual({ title: 'MyComponent' });
 
-    const registeredComponentClass = Navigation.componentRegistry.registerComponent('MyComponentName', () => MyConnectedComponent);
+    const registeredComponentClass = Navigation.registerComponent('MyComponentName', () => MyConnectedComponent);
     expect(registeredComponentClass.options).toEqual({ title: 'MyComponent' });
   });
 });