nbTagInput and nbAutocomplete combined use to trigger multiple add

### Issue type

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

* [x] bug report

### Issue description

**Current behavior:**

nbTagInput and nbAutocomplete combined use to trigger multiple onTagAdd.

When moving the autocomplete option by keyboard, it will trigger multiple times after confirming

**Expected behavior:**

trigger once

**Steps to reproduce:**

**Related code:**

```








{{ item.name }}

```

### Other information:

**npm, node, OS, Browser**

```
node: 14
```

**Angular, Nebular**

```
Angular: 13
```