Annotator doesn't support slices

The annotator's support for slices is managed on the UI side. The UI detects if it is within a slice, then systematically includes the ontologies of the current slice into the "ontologies" parameter for the API call.

Done in this commit: https://github.com/ontoportal-lirmm/bioportal_web_ui/pull/598/commits/79298f0e4042c10fe679831e2629183d9c607811