fix response `content-type` is not set if access without access token

Kairlec

2023-05-15 ca103731c721aae3f5f622e58c679ed5c09fd9e9

 src/main/java/com/genersoft/iot/vmp/vmanager/gb28181/gbStream/GbStreamController.java

@@ -17,7 +17,7 @@
import java.util.List;

@Tag(name  = "视频流关联到级联平台")
@CrossOrigin

@RestController
@RequestMapping("/api/gbStream")
public class GbStreamController {