message: fix isConnectedTo query
diff: @@ -278,7 +278,7 @@ function checkConnected(ctx: IsConnectedToCtx, structure: Structure) {
  for (let li = 0; li < buCount; li++) {
  const lu = bondedUnits[li];
  - const bUnit = structure.unitMap.get(lu.unitB) as Unit.Atomic;
  + const bUnit = input.unitMap.get(lu.unitB) as Unit.Atomic;
  const bElements = bUnit.elements;
  const bonds = lu.getEdges(inputIndex);
  for (let bi = 0, _bi = bonds.length; bi < _bi; bi++) {
  