fix autosetup.py when OpenMP is turned off

[lukashergt]

The automatic installation of classy is handled in the Makefile as:

ifdef OMPFLAG
	cp python/setup.py python/autosetup.py
else
	grep -v "lgomp" python/setup.py > python/autosetup.py
endif
	cd python; export CC=$(CC); $(PYTHON) autosetup.py install || $(PYTHON) autosetup.py install --user
	rm python/autosetup.py

If OpenMP is turned off, this deletes the line containing lgomp. However, that line contains a closing bracket which mustn't be deleted. In this PR I moved the closing bracket to a new line such that the line containing lgomp can be safely deleted.