menu doesn't hide in mobile

### Issue type

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

* [ x] bug report
* [ ] feature request
* [ ] question about the decisions made in the repository

### Issue description

**Current behavior:**
In my custom ngx-admin system, menu doesn't hide after selecting an option in mobile viewport.

**Expected behavior:**
In demo, mobile ngx-admin closes menu after selecting an option for navigation.

**Steps to reproduce:**
1) open menu
2) select an option
3) menu hide
4) page loaded.