Add detach/attach re-enumeration after MIDI interface added

src/midi_transport.cpp

@@ -18,6 +18,13 @@ bool UsbMidiTransport::begin() {
         return false;
     }
 
+    if (TinyUSBDevice.mounted()) {
+        Serial.println("[MIDI] Re-enumerating with MIDI interface...");
+        TinyUSBDevice.detach();
+        delay(10);
+        TinyUSBDevice.attach();
+    }
+
     initialized = true;
     return true;
 }