Revert "Package __init__.py within ensurepip's bundled directory"
    
    This reverts commit 78bc51a18dc67efd483dfee5e7840323469b1bf9.
    
    This is applicable only to Python 3.9, see https://github.com/python/cpython/commit/2ccb50cf773881255c5669942a093eb68ad042f6