stig: reenable test not failing on Linux

pkgs/applications/networking/p2p/stig/default.nix

@@ -40,13 +40,12 @@ python3Packages.buildPythonApplication rec {
 
   pytestFlagsArray = [
     "tests"
-    # test_string__month_day_hour_minute_second fails on darwin
-    "--deselect=tests/client_test/ttypes_test.py::TestTimestamp::test_string__month_day_hour_minute_second"
     # TestScrollBarWithScrollable.test_wrapping_bug fails
     "--deselect=tests/tui_test/scroll_test.py::TestScrollBarWithScrollable::test_wrapping_bug"
     # https://github.com/rndusr/stig/issues/214
     "--deselect=tests/completion_test/classes_test.py::TestCandidates::test_candidates_are_sorted_case_insensitively"
   ] ++ lib.optionals stdenv.isDarwin [
+    "--deselect=tests/client_test/ttypes_test.py::TestTimestamp::test_string__month_day_hour_minute_second"
     "--deselect=tests/client_test/aiotransmission_test/api_torrent_test.py"
     "--deselect=tests/client_test/aiotransmission_test/rpc_test.py"
   ];