Remove ignore of the files that should not be generated
Although pyac is Python project and it is reasonable to include .pyc,
__pycache__ ignores, but I am confident, that an adequate Python setup
must not generate them at all. They are more than useless and must be
globally disabled on the system (PYTHONDONTWRITEBYTECODE=1), so should
not appear at all. Even if they are created, user should ignore them
globally in its own global .gitignore, rather in each Python-related
project.