CanonicalSmiles saver contains extended part.

[AliaksandrDziarkach]

Steps to Reproduce
Run next python code:

from env_indigo import Indigo

indigo = Indigo()
sm_original = "C1C=[C]C=CC=1"
mol = indigo.loadMolecule(sm_original)
sm_canon = mol.canonicalSmiles()
print(sm_canon)

got "C1=CC=CC=[C]1 |^1:5|" which is wrong - canonical SMILES should not contains " |...|" part.
The " |...|" part is extended features provided by Extended SMILES.

Canonical SMILE should not contains extended data(" |...|").

[AliaksandrDziarkach]

Fixed with #1211