Freestyle: use bool instead of int.

Patch contribution by flokkievids (Folkert de Vries).  Thanks!

source/blender/freestyle/intern/python/BPy_ViewShape.cpp

@@ -101,7 +101,7 @@ static int ViewShape_init(BPy_ViewShape *self, PyObject *args, PyObject *kwds)
 		PyErr_SetString(PyExc_TypeError, "invalid argument(s)");
 		return -1;
 	}
-	self->borrowed = 0;
+	self->borrowed = false;
 	Py_XINCREF(self->py_ss);
 	return 0;
 }