Fix local module library loading

In yesterday's attempt to remove reliance on pathlib, I accidentally broke automatic loading from the local module. (It is possible to manually override the path via environment variable, though.) This release fixes automatic loading of the Qrack library from within the module path.

sha1sum results:
a1aac37fec96b9c128b315e78175bedf81c34446 pyqrack-1.29.10-py3-none-macosx_10_4_universal2.whl
df41c565f8b536b6a32009f62892f5f4fc1ecfb6 pyqrack-1.29.10-py3-none-manylinux2014_x86_64.whl
c78e456d5d0ec7065068cfa67aa8a39400c77c50 pyqrack-1.29.10-py3-none-manylinux_2_35_armv7l.whl
c2e36237e0fc417732828270b828dd7b8251939c pyqrack-1.29.10-py3-none-manylinux_2_35_x86_64.whl
7a487c4759d64641f904deb9185e0a2acb8f82ce pyqrack-1.29.10-py3-none-manylinux_2_39_x86_64.whl
6f5f8e85c0d2c2a17916251781790b460de465aa pyqrack-1.29.10-py3-none-manylinux_2_40_aarch64.whl
bfa56c0cfa02fb4d25ef1695b7f07054c9d7de29 pyqrack-1.29.10-py3-none-win_amd64.whl
5cf520b7b543d327ecaa2236354c566f3b8ec1c7 pyqrack-1.29.10.tar.gz