Token is not changed after logout/login again

### 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:**
Standard Java/Spring E-Commerce Bundle. The RoleProvider returns an outdated role, it seems the token store is not cleared on logout. Only browser page refresh helps.

**Expected behavior:**
RoleProvider returns the active user role.

**Steps to reproduce:**
1. login with admin
2. logout
3. login with user

The 'users' menu is visible, however, it mustn't be visible only for admin.

**Related code:**

```
PagesMenu
...
return this.accessChecker.isGranted('view', 'users')
.pipe(map(hasAccess => {
if (hasAccess) {
return [...dashboardMenu, ...ordersMenu, userMenu, ...menu];
} else {
return [...dashboardMenu, ...ordersMenu, ...menu];
}
}));
```

### Other information:

**Angular, Nebular**
```
"@agm/core": "^1.0.0-beta.5",
"@angular/animations": "^8.0.0",
"@angular/cdk": "^8.0.0",
"@angular/common": "^8.0.0",
"@angular/compiler": "^8.0.0",
"@angular/core": "^8.0.0",
"@angular/forms": "^8.0.0",
"@angular/platform-browser": "^8.0.0",
"@angular/platform-browser-dynamic": "^8.0.0",
"@angular/router": "^8.0.0",
"@asymmetrik/ngx-leaflet": "3.0.1",
"@nebular/auth": "4.6.0",
"@nebular/eva-icons": "4.6.0",
"@nebular/security": "4.6.0",
"@nebular/theme": "4.6.0",
```