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

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

src/whitenoise/middleware.py

@@ -96,7 +96,7 @@ def __init__(self, get_response=None, settings=settings):
             if settings.FORCE_SCRIPT_NAME:
                 script_name = settings.FORCE_SCRIPT_NAME.rstrip("/")
                 if self.static_prefix.startswith(script_name):
-                    self.static_prefix = self.static_prefix[len(script_name):]
+                    self.static_prefix = self.static_prefix[len(script_name) :]
         self.static_prefix = ensure_leading_trailing_slash(self.static_prefix)
 
         self.static_root = settings.STATIC_ROOT