Don't byteswap Fingerprints when encoding
Don't byteswap Fingerprints when encoding

Byteswapping Fingerprints when encoding is unnessesary and breaks if
the Fingerprint is later decoded on a machine with different endianness
to the one it was encoded on. Fix by removing the Encodable and
Decodable implementations and use the ones derived from RustcEncodable
and RustcDecodable.

Fixes #42239

graydon/rust,GBGamer/rust,graydon/rust,GBGamer/rust,aidancully/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust