fix formatting

Author: gwenya

wagtailcache/cache.py

@@ -246,7 +246,7 @@ def process_request(self, request: WSGIRequest) -> Optional[HttpResponse]:
         response: HttpResponse
         if "If-None-Match" in request.headers and "Etag" in response.headers and \
             response.headers["Etag"] in parse_etags(
-            request.headers["If-None-Match"]):
+                request.headers["If-None-Match"]):
             not_modified = HttpResponse(status=304)
             not_modified.headers["Etag"] = response.headers["Etag"]
             # TODO: Cache-Control and Expires?