dev-python/aiohttp: remove unused patch(es)

Closes: https://github.com/gentoo/gentoo/pull/13101
Signed-off-by: Michael Mair-Keimberger <m.mairkeimberger@gmail.com>
Signed-off-by: Zac Medico <zmedico@gentoo.org>

dev-python/aiohttp/files/aiohttp-3.0.5-tests.patch

@@ -1,10 +0,0 @@
---- aiohttp-3.0.5/tests/test_test_utils.py
-+++ aiohttp-3.0.5/tests/test_test_utils.py
-@@ -243,6 +243,7 @@
-             make_url(URL('http://foo.com'))
- 
- 
-+@pytest.mark.skip("running via external test file fails")
- def test_testcase_no_app(testdir, loop):
-     testdir.makepyfile(
-         """