🚸(frontend) explain duplicate identity disconnect on feedback page

Add context to feedback page when user is disconnected for joining with
same identity, which is forbidden by LiveKit. Improves user understanding
of disconnection reasons.

src/frontend/src/features/rooms/components/Conference.tsx

@@ -127,7 +127,9 @@ export const Conference = ({
           })}
           onDisconnected={(e) => {
             if (e == DisconnectReason.CLIENT_INITIATED) {
-              navigateTo('feedback')
+              navigateTo('feedback', { duplicateIdentity: false })
+            } else if (e == DisconnectReason.DUPLICATE_IDENTITY) {
+              navigateTo('feedback', { duplicateIdentity: true })
             }
           }}
         >