Add missing key to room member li elements.

src/modules/room/RoomDetails.tsx

@@ -5,7 +5,7 @@ import { RoomState } from "modules/room/slice";
 const Members: FC<Props> = ({ room }) => {
   const children = [];
   for (const member of room.members) {
-    children.push(<li>{member}</li>);
+    children.push(<li key={member}>{member}</li>);
   }
 
   return <ul>{children}</ul>;