🩹(frontend) avoid evaluating with 0 in ParticipantList

Even if the list is empty, previous assertion was returning true.
Fixed it, mybad, noob error.

In fact, the participants list should never be empty, as you are
in the meeting to access it.

src/frontend/src/features/rooms/livekit/components/controls/Participants/ParticipantsList.tsx

@@ -98,7 +98,7 @@ export const ParticipantsList = () => {
           <RiCloseLine />
         </Button>
       </Div>
-      {participants?.length && (
+      {participants?.length > 0 && (
         <VStack
           role="list"
           className={css({