Fingerprint SNP positions should be hg38 coordinates, not GRCh37

[mdshw5]

• Need to edit the VCF header: https://github.com/Novartis/pisces/blob/master/pisces/scripts/kmer_counts_to_fingerprint_strand_and_pcthuman.py#L173-L206
• Liftover the positions in the 4th column of https://github.com/Novartis/pisces/blob/master/pisces/data/fp_kmers.txt