Enable manual re-addition of filtered out precursors (due to near cycles in IPP)

Currently, precursors filtered out by the 'Filter Near Cycles' feature in IPP cannot be re-added to canvas (red circle at bottom left). Example shown in image below (precursor rank 1). Enable support for manually re-adding these precursors.

image

  • Input smiles: Brc1ccccc1
  • Strategy Settings: Filter near cycles turned on, default for all others