Fixes MATLAB engine not shutting down

[StephenNneji]

Fixes #186

Without this change the simple script below runs indefinitely on Windows

import ratapi as RAT

if __name__ == "__main__":
    print("Hello")

[DrPaulSharp]

It works!

[StephenNneji]

As a Note, I was able to replicate the problem on Ubuntu 22.04 and this fix worked there too. I could not replicate problem on MacOS