conftest: remove workaround

pytest-dev/pytest-django#1076 has been merged &
released (in 4.6.0).

tests/conftest.py

@@ -246,22 +246,6 @@ def _fail_for_invalid_template_variable_improved(_fail_for_invalid_template_vari
         )
 
 
-@pytest.fixture(autouse=True)
-def _template_string_if_invalid_marker(monkeypatch, request) -> None:
-    # TODO: remove me once https://github.com/pytest-dev/pytest-django/pull/1076 is merged & released
-    marker = request.keywords.get("ignore_template_errors", None)
-    if os.environ.get(INVALID_TEMPLATE_VARS_ENV, "false") == "true":
-        if marker and django_settings_is_configured():
-            from django.conf import settings as dj_settings
-
-            if dj_settings.TEMPLATES:
-                monkeypatch.setattr(
-                    dj_settings.TEMPLATES[0]["OPTIONS"]["string_if_invalid"],
-                    "fail",
-                    False,
-                )
-
-
 @pytest.fixture(scope="session", autouse=True)
 def make_unordered_queries_randomly_ordered():
     """