[vim/vim] vim9: wrong type of unpacked tuple (Issue #21058)

mao-yining created an issue (vim/vim#21058)

### Steps to reproduce

```vim
vim9script
def B()
		var [a; b] = (true, true, true)
		echo b
		echo typename(b)
enddef
B()
```
Output: 
```
(true, true)
tuple<bool, bool, bool>
```

### Expected behaviour

(true, true)
tuple<bool, bool>


### Version of Vim

9.2.925

### Environment

MS-Windows 11

### Logs and stack traces

```shell

```

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