Also depict (CX)SMILES for chemical classes

[egonw]

Fixes that the 'chemical-class' aspect did not show SMILES, even tho SMILES and CXSMILES can be given and can be depicted.

Description

Now also shows (CX)SMILES in the chemical-class aspect:

Caveats

Functionality that already existed for the chemical aspect and is just ported here.

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
  • I have made corresponding changes to the documentation
• This change requires new dependencies (please list)

If you make changes to the Python code

• My code passes the tox check, I can receive warnings about tests, documentation or both

Testing

• http://127.0.0.1:8100/chemical-class/Q120868227

Checklist

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have not used code from external sources without attribution
• I have considered accessibility in my implementation
• There are no remaining debug statements (print, console.log, ...)