[cartridge] molecular equality should use do_chiral_sss setting

[greglandrum]

If we're not doing chiral substructure search, this query should return true:

chembl_25=# set rdkit.do_chiral_sss=false;
SET
chembl_25=# select 'C[C@H](F)Cl'::mol@='C[C@@H](F)Cl'::mol;
 ?column? 
----------
 f
(1 row)