BF: fixes Minolta recognition error in python 3.9 (maybe other versions of python 3.x are also affected) #4186
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There was a type error that prevented the Minolta class to get initialized. Error was:
ERROR Couldn't initialize photometer LS100: can't concat str to bytes
It turns out the error was due to different variable types (bytes or string). The commit fixes the inconsistency.
I'm not sure if this error occurs exclusively in python 3.9. I tried to install psychopy in a conda environment with python 3.6 (as recommended by the documentation) but I failed to install wxpython (which is whole another story).