Duplicate buffer in asByteBufferUnsafe

[armanbilge]

So that its position / limit are independent.

scodec-bits/core/shared/src/main/scala/scodec/bits/ByteVector.scala

Lines 770 to 776 in 0b7a1af

	/** Zero-copy version of [[toByteBuffer]]. In the case where this vector is a wrapper
	* around a buffer or array, a buffer backed by the same data is returned. The
	* returned buffer has an independent position and limit.
	*
	* @group conversions
	*/
	final def toByteBufferUnsafe: ByteBuffer =