shared/tinyusb: Use new persistent-tx-fifo configure interface.

The old configuration option has been removed from TinyUSB.

Signed-off-by: Damien George <damien@micropython.org>

shared/tinyusb/mp_usbd_runtime.c

@@ -428,8 +428,10 @@ void mp_usbd_init(void) {
     }
 
     if (need_usb) {
-        tusb_init(); // Safe to call redundantly
-        tud_connect(); // Reconnect if mp_usbd_deinit() has disconnected
+        // The following will call tusb_init(), which is safe to call redundantly.
+        mp_usbd_init_tud();
+        // Reconnect if mp_usbd_deinit() has disconnected.
+        tud_connect();
     }
 }