message: fix mapping issues in bondedAtomicPairs
diff: @@ -353,7 +353,7 @@ export function bondedAtomicPairs(bondTest?: QueryPredicate): StructureQuery {
  atomicBond.a.unit = structure.unitMap.get(bond.unitA) as Unit.Atomic;
  atomicBond.a.element = atomicBond.a.unit.elements[bond.indexA];
  atomicBond.aIndex = bond.indexA;
  - atomicBond.b.unit = structure.unitMap.get(bond.unitA) as Unit.Atomic;
  + atomicBond.b.unit = structure.unitMap.get(bond.unitB) as Unit.Atomic;
  atomicBond.b.element = atomicBond.b.unit.elements[bond.indexB];
  atomicBond.bIndex = bond.indexB;
  atomicBond.order = bond.props.order;
  