python3Packages.tinycss2: unbreak

Newly breaking due to changes in pytest-flake8, resolved with upstream
patch.

Took the opportunity to clean up the package a little bit too, remove
unnecessary patch.

pkgs/development/python-modules/tinycss2/default.nix

@@ -1,6 +1,16 @@
-{ lib, buildPythonPackage, pythonOlder, fetchPypi
+{ lib
+, buildPythonPackage
+, pythonOlder
+, fetchPypi
+, fetchpatch
 , webencodings
-, pytest, pytestrunner, pytestcov, pytest-flake8, pytest-isort }:
+# Check inputs
+, pytest
+, pytestrunner
+, pytestcov
+, pytest-flake8
+, pytest-isort
+}:
 
 buildPythonPackage rec {
   pname = "tinycss2";
@@ -12,7 +22,15 @@ buildPythonPackage rec {
     sha256 = "1kw84y09lggji4krkc58jyhsfj31w8npwhznr7lf19d0zbix09v4";
   };
 
-  patches = [ ./remove-redundant-dependency.patch ];
+  patches = [
+    (
+      fetchpatch {
+        name = "tinycss2-fix-pytest-flake8-fail.patch";
+        url = "https://github.com/Kozea/tinycss2/commit/6556604fb98c2153412384d6f0f705db2da1aa60.patch";
+        sha256 = "1srvdzg1bak65fawd611rlskcgn5abmwmyjnk8qrrrasr554bc59";
+      }
+    )
+  ];
 
   propagatedBuildInputs = [ webencodings ];