Accordion trigger two time

### Issue type

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

* [x ] bug report
* [ ] feature request

### Issue description

**Current behavior:**
Trigger (collapsedChange) event emitter by open/close the nb-accordion-item
if i opened the accordion, its logged true and false, otherwise, it logged true and true

**Expected behavior:**
only logging true when open
only logging false when close

**Steps to reproduce:**
open and close the accordion
**Related code:**
```

Item Content

```
```
something(isOpen: boolean): void {
console.log(isOpen)
}
```
log:

```
true
false
true
true
true
false
true
true
```
### Other information:

**npm, node, OS, Browser**
```
Node, npm: v18.17.0 and 9.8.1
OS: Windows (7/8/10)
Browser: MSEdge
```

**Angular, Nebular**
```
"@angular/core": "^16.1.0",
"@nebular/eva-icons": "^11.0.0",
"@nebular/theme": "^11.0.0",
```