feat(FilterBtn): render static/preselected option if only one available #258
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if there is only one option available, instead of showing the filter, show a "badge" with the only choice available.
This could happen in a multi-filter situation.
e.g. selecting "Prenotato" in the "Stato" filter would make "Si" the only option available in "Immatricolabile" filter, so we show directly the "Immatricolabile: Si" selected.
Notice the difference between the "Stato" filter (dotted with transparent bg => can click and change) and the "Immatricolabile" one (with light bg and no dotted border, title and selected option on the same hierarchy level)
This is a similar behaviour like the course-location multi-select filters: if a course has only one location, we select it and make it "unchangeable" with a similar UI/UX.