Allow clicking on a selected term from the preview to remove it from the filters

[arteymix]

When a term is already selected, display a chip with a "-" symbol to remove the term from the query.

It will also serve as a visual hint that the annotation is being used as a filter.

[libby-natola]

commit 3589d4e44900dbe86e80899949beb4b612d9587c