[fix] issue from PR sphinx-doc#160 - scripts do miss arguments `sys.a…

…rgv[1:]`

To reproduce the issue read comment [1].

[1] https://github.com/sphinx-doc/sphinx-autobuild/pull/160/files#r1620387971

Closes: sphinx-doc#162
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

sphinx_autobuild/__main__.py

@@ -27,7 +27,7 @@ def main(argv=()):
     """Actual application logic."""
     colorama.init()
 
-    args, build_args = _parse_args(list(argv))
+    args, build_args = _parse_args(list(argv) or sys.argv[1:])
 
     src_dir = args.sourcedir
     out_dir = args.outdir