sci-libs/branca: remove unused patch(es)

Signed-off-by: Michael Mair-Keimberger <mmk@levelnine.at>
Signed-off-by: Alfredo Tupone <tupone@gentoo.org>

sci-libs/branca/files/branca-0.6.0-test.patch

@@ -1,12 +0,0 @@
---- a/setup.cfg	2023-02-09 09:15:07.186333281 +0100
-+++ b/setup.cfg	2023-02-09 09:15:17.596181143 +0100
-@@ -1,9 +1,4 @@
- [tool:pytest]
--flake8-max-line-length = 105
--flake8-ignore =
--    docs/* ALL
--    versioneer.py ALL
--    branca/_version.py ALL
- markers =
-     headless: mark headless tests (deselect with '-m "not headless"')
-