Fix the compilation of contract ABI in setup.py
Fix the compilation of contract ABI in setup.py

A previous change I had made inadvertedly broke the static abi
compilation of contracts via setup.py. This should fix it.

tomashaber/raiden,tomashaber/raiden,hackaugusto/raiden,tomashaber/raiden,hackaugusto/raiden,tomashaber/raiden,tomashaber/raiden