cleanup moonraker and snapmaker printer agents

src/slic3r/GUI/DeviceManager.cpp

@@ -1793,8 +1793,6 @@ int MachineObject::command_ams_refresh_rfid2(int ams_id,  int slot_id)
 int MachineObject::command_start_camera()
 {
     if (!m_agent) return -1;
-    // why: this fires from the camera view's renew timer, so a refusal must stay silent -
-    // show_unsupported_dlg() here would pop a dialog every ~5 min on every other printer.
     return m_agent->command_start_camera(get_dev_id());
 }