Incorrect `Kind` for `bf16`

[laggui]

Just stumbled upon this incorrect definition for bf16.

Shouldn't KIND be Kind::BFloat16 here?

tch-rs/src/wrappers/kind.rs

Lines 158 to 161 in ca61fe0

	unsafe impl Element for half::bf16 {
	const KIND: Kind = Kind::Half;
	const ZERO: Self = half::bf16::ZERO;
	}