[1.7.x] Fixed flake8 warnings.

Backport of 35f46ec7a9 from master

tests/forms_tests/tests/test_validators.py

@@ -29,10 +29,10 @@ class UserForm(forms.Form):
         max_length=50,
         validators=[
             validators.RegexValidator(
-                    regex='^[a-z]*$',
-                    message="Letters only.",
-                    flags=re.IGNORECASE,
-                )
+                regex='^[a-z]*$',
+                message="Letters only.",
+                flags=re.IGNORECASE,
+            )
         ]
 
     )

tests/template_tests/tests.py

@@ -642,7 +642,7 @@ class TemplateTests(TestCase):
         # SYNTAX --
         # 'template_name': ('template contents', 'context dict', 'expected string output' or Exception class)
         # This import is necessary when tests are run isolated:
-        from .templatetags import custom
+        from .templatetags import custom  # noqa
         basedir = os.path.dirname(os.path.abspath(upath(__file__)))
         tests = {
             ### BASIC SYNTAX ################################################