dev-python/black: remove unused patch

Closes: https://github.com/gentoo/gentoo/pull/17602
Package-Manager: Portage-3.0.7, Repoman-3.0.1
Signed-off-by: Michael Mair-Keimberger <m.mairkeimberger@gmail.com>
Signed-off-by: Conrad Kostecki <conikost@gentoo.org>

dev-python/black/files/black-19.10_beta0-setuptools_scm.patch

@@ -1,24 +0,0 @@
-diff --git a/setup.py b/setup.py
-index 614a8d6..66946b2 100644
---- a/setup.py
-+++ b/setup.py
-@@ -1,6 +1,7 @@
- # Copyright (C) 2018 Łukasz Langa
- from setuptools import setup
- import sys
-+import os
- 
- assert sys.version_info >= (3, 6, 0), "black requires Python 3.6+"
- from pathlib import Path  # noqa E402
-@@ -17,10 +18,7 @@ def get_long_description() -> str:
- 
- setup(
-     name="black",
--    use_scm_version={
--        "write_to": "_black_version.py",
--        "write_to_template": 'version = "{version}"\n',
--    },
-+    version=os.getenv("MY_PV"),
-     description="The uncompromising code formatter.",
-     long_description=get_long_description(),
-     long_description_content_type="text/markdown",