setup.py: fix whitespace

setup.py

@@ -404,8 +404,7 @@ def ext_modules(extensions):
     if use_cython and cython_version >= REQUIRED_CYTHON_VERSION:
         return cythonize([Extension(*args, **kwrds)
                           for args, kwrds in extensions], language_level=3,
-                         compiler_directives={'linetrace': trace_cython}
-                        )
+                         compiler_directives={'linetrace': trace_cython})
 
     # Cython is not going to be run: replace pyx extension by that of
     # the shipped translated file.