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

Kairlec

2023-05-15 ca103731c721aae3f5f622e58c679ed5c09fd9e9

 src/main/java/com/genersoft/iot/vmp/jt1078/proc/response/J9101.java

@@ -6,6 +6,8 @@
import io.netty.util.CharsetUtil;

/**
 * 实时音视频传输请求
 *
 * @author QingtaiJiang
 * @date 2023/4/27 18:25
 * @email qingtaij@163.com