Fix handling of gamepad feedback with multiple clients connected

We need to use the client-relative index rather than the global index
when sending feedback to the client.

src/platform/macos/input.cpp

@@ -291,13 +291,13 @@ const KeyCodeMap kKeyCodesMap[] = {
   /**
    * @brief Creates a new virtual gamepad.
    * @param input The input context.
-   * @param nr The assigned controller number.
+   * @param id The gamepad ID.
    * @param metadata Controller metadata from client (empty if none provided).
    * @param feedback_queue The queue for posting messages back to the client.
    * @return 0 on success.
    */
   int
-  alloc_gamepad(input_t &input, int nr, const gamepad_arrival_t &metadata, feedback_queue_t feedback_queue) {
+  alloc_gamepad(input_t &input, const gamepad_id_t &id, const gamepad_arrival_t &metadata, feedback_queue_t feedback_queue) {
     BOOST_LOG(info) << "alloc_gamepad: Gamepad not yet implemented for MacOS."sv;
     return -1;
   }