Nested nb-reveal-card can't reveal seperate

### Issue type

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

* [X] bug report
* [ ] feature request

### Issue description

**Current behavior:**
Add a reveal card inside a reveal card and the revealed property of the nested component will follow the parent.

**Expected behavior:**
The nested card reveal should follow its own revealed parameter and not the parent one.

**Steps to reproduce:**
Use the understanding code. Its expected to show Front 2 (parent is revealed, and child is not revealed) but it shows BACK2. (parent is revealed and childs also revealed.

**Related code:**
`

FRONT1


BACK1








FRONT2


BACK2

`

### Other information:
Angular 15.2.0 and Nebular 11.0.0