Baid58 parse to TapretCommitment not work

[crisdut]

Hi @dr-orlovsky,

I tried use baid58 parse to TapretCommitment and received the follow error:

running 1 test
thread 'tapret::tapscript::test::commiment_serialization' panicked at 'exact size match: Decode(Io(Kind(InvalidInput)))', dbc/src/tapret/tapscript.rs:66:10

Test Code

#[test]
pub fn tapret_commitment_baid58() {
    let commitment = commitment();
    let _ =  TapretCommitment::from_baid58(commitment.to_baid58()).unwrap();
}

[dr-orlovsky]

This was caused by a bug in strict encoding: strict-types/strict-encoding#13

Fixed in #39