Auto collapse not working for nested menus

### Issue type

**I'm submitting a ...** (check one with "x")

* [x] bug report
* [ ] feature request

### Issue description

**Current behavior:**
When I use the NbMenuComponent with NbMenuItem[] three levels deep, the **autoCollapse** doesn't close second tier menus on click of second or third tier items.

**Expected behavior:**
When clicking on links in inner-level sub-menu's, any other open sub-menu's should close.

**Steps to reproduce:**
_Look at StackBlitz below_

- Click **Root level one**
- Click **Root level two**

_Here auto Collapse is working_

- Click **Second level two-one**
- Click **Third level two-one-one**
- Click **Second level two-two**

_auto Collapse should either be working here (closing **Second level two-one**); or_

- Click **Third level two-two-two**

_here._

**Related code:**

StackBlitz [Auto collapse example ](https://stackblitz.com/edit/github-du17cg)

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