Simplify the `sys.path` setting in the PyImportTests.
Simplify the `sys.path` setting in the PyImportTests.

Konstantin-Posudevskiy/pythonnet,vmuriart/pythonnet,dmitriyse/pythonnet,Konstantin-Posudevskiy/pythonnet,yagweb/pythonnet,vmuriart/pythonnet,AlexCatarino/pythonnet,pythonnet/pythonnet,QuantConnect/pythonnet,denfromufa/pythonnet,AlexCatarino/pythonnet,pythonnet/pythonnet,AlexCatarino/pythonnet,yagweb/pythonnet,yagweb/pythonnet,denfromufa/pythonnet,pythonnet/pythonnet,QuantConnect/pythonnet,dmitriyse/pythonnet,QuantConnect/pythonnet,yagweb/pythonnet,AlexCatarino/pythonnet,denfromufa/pythonnet,vmuriart/pythonnet,Konstantin-Posudevskiy/pythonnet,dmitriyse/pythonnet