revert to orig impl

Authored by: bashonly

yt_dlp/networking/common.py

@@ -517,7 +517,6 @@ class Response(io.IOBase):
             self.reason = reason or HTTPStatus(status).phrase
         except ValueError:
             self.reason = None
-        self.extras = {}
 
     def readable(self):
         return self.fp.readable()

yt_dlp/networking/impersonate.py

@@ -67,8 +67,7 @@ class ImpersonateResponse(Response):
     """
     def __init__(self, *args, impersonate: ImpersonateTarget | None, **kwargs):
         super().__init__(*args, **kwargs)
-        if impersonate is not None:
-            self.extras['impersonate'] = impersonate
+        self.impersonate = impersonate
 
 
 class ImpersonateRequestHandler(RequestHandler, ABC):