fix: double mutation in codon when moving up the tree #1235
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when a samples shared all privated nuc mutations with a parent, we move up the tree and subtract the shared mutations. However, in rare cases when there are multiple mutations in a codon, not all amino acid mutations are shared. hence we still need to handle left over mutations also in the case where we just move up the tree, not only when we move down the tree.
This change actually harmonized cases and reduced code duplication.