net/http: also clone DynamicRecordSizingDisabled in cloneTLSConfig

Updates #15771

Change-Id: I5dad96bdca19d680dd00cbd17b72a03e43eb557e
Reviewed-on: https://go-review.googlesource.com/23283Reviewed-by: Tom Bergan <tombergan@google.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>

src/net/http/transport.go

@@ -2024,6 +2024,8 @@ func cloneTLSConfig(cfg *tls.Config) *tls.Config {
 		MinVersion:                  cfg.MinVersion,
 		MaxVersion:                  cfg.MaxVersion,
 		CurvePreferences:            cfg.CurvePreferences,
+		DynamicRecordSizingDisabled: cfg.DynamicRecordSizingDisabled,
+		Renegotiation:               cfg.Renegotiation,
 	}
 }
 
@@ -2053,6 +2055,7 @@ func cloneTLSClientConfig(cfg *tls.Config) *tls.Config {
 		MinVersion:                  cfg.MinVersion,
 		MaxVersion:                  cfg.MaxVersion,
 		CurvePreferences:            cfg.CurvePreferences,
+		DynamicRecordSizingDisabled: cfg.DynamicRecordSizingDisabled,
 		Renegotiation:               cfg.Renegotiation,
 	}
 }