Remove dead pylint 2 compat code in foreign_key_strings.py

Author: Pierre-Sassoulas

pylint_django/checkers/foreign_key_strings.py

@@ -90,14 +90,7 @@ def open(self):
             # this means that Django wasn't able to configure itself using some defaults
             # provided (likely in a DJANGO_SETTINGS_MODULE environment variable)
             # so see if the user has specified a pylint option
-            if hasattr(self, "linter"):
-                django_settings_module = self.linter.config.django_settings_module
-            else:
-                # TODO: remove this no-member ignore : this is to avoid the missing `config` for pylint 3+,
-                #  and can be removed once pylint 2
-                # pylint: disable=no-member
-                django_settings_module = self.linter.config.django_settings_module
-
+            django_settings_module = self.linter.config.django_settings_module
             if django_settings_module is None:
                 # we will warn the user that they haven't actually configured Django themselves
                 self._raise_warning = True