Remove call to binary_to_existing_atom (#712)
Remove call to binary_to_existing_atom (#712)

This function is only available from OTP 23 and ginger is stuck on OTP 22

Co-authored-by: Colin de Roos <342564bc1ab1e55103f85104b5e013adfdf828cb@driebit.nl>
driebit/ginger,driebit/ginger,driebit/ginger