`chemical-class` SPARQL queries need checking to not run on legacy

[egonw]

The follow panel/SPARQL queries need updating:

• https://github.com/WDscholia/scholia/blob/main/scholia/app/templates/chemical-class_class-hierarchy.sparql
• https://github.com/WDscholia/scholia/blob/main/scholia/app/templates/chemical-class_identifiers.sparql
• https://github.com/WDscholia/scholia/blob/main/scholia/app/templates/chemical-class_related-chemicals.sparql
• https://github.com/WDscholia/scholia/blob/main/scholia/app/templates/chemical-class_recent-literature.sparql
• https://github.com/WDscholia/scholia/blob/main/scholia/app/templates/chemical-class_publications-per-year.sparql
• https://github.com/WDscholia/scholia/blob/main/scholia/app/templates/chemical-class_found-in-taxon.sparql