message: fix: prevent buffer overflow in coord map
diff: @@ -98,7 +98,7 @@ Range CoordinateMapper::alnToRef(const Range& alnRange) const {
  precondition_less(alnRange.begin, alnRange.end);
  const Range refRange{
  .begin = alnToRef(alnRange.begin),
  - .end = alnToRef(alnRange.end),
  + .end = alnToRef(alnRange.end - 1) + 1,
  };
  postcondition_less(refRange.begin, refRange.end);
  return refRange;
  @@ -108,7 +108,7 @@ Range CoordinateMapper::refToAln(const Range& refRange) const {
  precondition_less(refRange.begin, refRange.end);
  const Range alnRange{
  .begin = refToAln(refRange.begin),
  - .end = refToAln(refRange.end),
  + .end = refToAln(refRange.end - 1) + 1,
  };
  postcondition_less(alnRange.begin, alnRange.end);
  return alnRange;
  