arrow

GH-45362: [C++] Fix identity cast for time and list scalar (#45370)

### Rationale for this change

The PR https://github.com/apache/arrow/pull/40237 introduced code:

```
// time to time
template <typename To, typename From, typename T = typename To::TypeClass>
```

However, the `Time64Type::TypeClass` doesn't exist, so SFINAE always failed.

### Are these changes tested?

Yes

### Are there any user-facing changes?

No.

* GitHub Issue: #45362

Authored-by: mwish <maplewish117@gmail.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>