Better support for Samsung SmartTV for built-in DLNA server (#4784)

internal/dlna/cds.go

@@ -85,7 +85,6 @@ func sceneToContainer(scene *models.Scene, parent string, host string) interface
 		Path:   iconPath,
 		RawQuery: url.Values{
 			"scene": {strconv.Itoa(scene.ID)},
-			"c":     {"jpeg"},
 		}.Encode(),
 	}).String()
 

internal/dlna/dms.go

@@ -595,6 +595,8 @@ func (me *Server) initMux(mux *http.ServeMux) {
 			return
 		}
 
+		w.Header().Set("transferMode.dlna.org", "Streaming")
+		w.Header().Set("contentFeatures.dlna.org", "DLNA.ORG_OP=01;DLNA.ORG_CI=0;DLNA.ORG_FLAGS=01500000000000000000000000000000")
 		me.sceneServer.StreamSceneDirect(scene, w, r)
 	})
 	mux.HandleFunc(rootDescPath, func(w http.ResponseWriter, r *http.Request) {