Sub Menu Dropdown header remains highlighted after routing away

[developcodeza-matthew]

Reproduction link

https://ng.ant.design/components/menu/en (see first example) or https://iuaccq.run.stackblitz.io

Steps to reproduce

Issue can even be reproduced in official docs example.

1. Go to first example here https://ng.ant.design/components/menu/en (same as stackblitz link above)
2. Open Navigation Three - Submenu
3. Click on any dropdown option
4. Then click on Navigation One

What is expected?

Navigation Three - Submenu should not remain highlighted

What is actually happening?

Navigation Three - Submenu is still highlighted (together with Navigation One)

Environment	Info
ng-zorro-antd	7.3.3
Browser	Chrome Version 74.0.3729.131 (Official Build) (64-bit)