Stop setting TEMPLATE_STRING_IF_INVALID, no longer in supported Django version

Author: bluetech

pytest_django/plugin.py

@@ -653,11 +653,7 @@ def __mod__(self, var):
         from django.conf import settings as dj_settings
 
         if dj_settings.TEMPLATES:
-            dj_settings.TEMPLATES[0]["OPTIONS"][
-                "string_if_invalid"
-            ] = InvalidVarException()
-        else:
-            dj_settings.TEMPLATE_STRING_IF_INVALID = InvalidVarException()
+            dj_settings.TEMPLATES[0]["OPTIONS"]["string_if_invalid"] = InvalidVarException()
 
 
 @pytest.fixture(autouse=True)