if gdbserver is missing when remote debugging, you have to restart QtCreator to be able to remote debug again

Tried to remote debug on a crashing process, but forgot to install gdbserver on my remote machine. Once it was rectified, I couldn't remote-debug because QtCreator disables the Debugging launching button and the only way to get it back is to restart QtCreator. It is a very minor issue, just an annoyance.