nb-sidebar does not display NbMenuItem children

[denisobrienirl]

Issue type

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

• bug report (at least it seems so)

Issue description

Current behavior:
It's a tough one to explain in English, but here is my best attempt at it...

nb-sidebar does not display NbMenuItem children if initiated with state="compacted" and returned to from any auth pages(login, password reset, etc...)
NOTE: This issue does not occur if state="compacted" in NOT used.

Expected behavior:
NbMenuItem children should be displayed.

Steps to reproduce:
No English can explain this, here are some breadcrumbs and an animated gif :)

With state="compacted"
Dashboard loaded --> Sidebar expanded --> Auth group expanded --> Login selected --> Browser 'Go Back' button clicked --> Observing that no children exist for Auth menu group.

Without state="compacted"
Dashboard loaded --> Auth group expanded --> Login selected --> Browser 'Go Back' button clicked --> Observing that children items are present in Auth menu group.

Related code:
sample.layout.ts

<nb-sidebar class="menu-sidebar"
                   tag="menu-sidebar"
                   state="compacted"
                   responsive
                   [end]="sidebar.id === 'end'">

Other information:

npm, node, OS, Browser

Node: v10.5.0
NPM: 6.0.1
OS: Ubuntu 18.04 LTS
Browser: Chrome Version 67.0.3396.87 (Official Build) (64-bit)

Angular, Nebular

"@angular/core": "6.0.0",
"@nebular/auth": "2.0.0-rc.9",
"@nebular/security": "2.0.0-rc.9",
"@nebular/theme": "2.0.0-rc.9",

[nnixaa]

Hi @denisobrienirl, thanks for reporting! Yes, we can see it (probably related to #444). Should be fixed in the next rc.