Don't need cov.pth hack anymore either way

Author: hynek

tox.ini

@@ -38,7 +38,6 @@ dependency_groups = cov
 set_env =
     COVERAGE_PROCESS_START={toxinidir}/pyproject.toml
     PYTHONWARNINGS=d
-commands_pre = python -c 'import pathlib; pathlib.Path("{env_site_packages_dir}/cov.pth").write_text("import coverage; coverage.process_startup()")'
 commands =
     coverage run -m pytest {posargs}