Fixed bug in how Python executables are found.

We can't rely on the `executable` field in `pyvenv.cfg`
becuase it refers to the base executable, not that in
the venv.

src/venv_management/api.py

@@ -219,15 +219,10 @@ def python_executable_path(env_dirpath: Union[Path, str]) -> Path:
  ValueError: If the env_dirpath is not a virtual environment.
  """
  env_dirpath = Path(env_dirpath)
- exe_filepath = pyvenv_config(env_dirpath, "executable")
-
- if not exe_filepath:
- exe_filepath = (
- env_dirpath / "Scripts" / "python.exe"
- if sys.platform == "win32" else
- env_dirpath / "bin" / "python"
- )
- exe_filepath = Path(exe_filepath)
+ if sys.platform == 'win32':
+ exe_filepath = env_dirpath / "Scripts" / "python.exe"
+ else:
+ exe_filepath = env_dirpath / "bin" / "python"
 
  if not exe_filepath.exists():
  raise ValueError(