[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

src/flask/app.py

@@ -523,8 +523,8 @@ class Flask(Scaffold):
            # Note we do this without checking if static_folder exists.
            # For one, it might be created while the server is running (e.g. during
            # development). Also, Google App Engine stores static files somewhere"""
-        
-        
+
+
         if self.has_static_folder:
             assert (
                 bool(static_host) == host_matching