fix:os

mec-biz/src/main/java/com/ym/mec/biz/dal/entity/ImLiveBroadcastRoom.java

@@ -81,7 +81,7 @@ public class ImLiveBroadcastRoom implements Serializable {
 
     @TableField("os_")
     @ApiModelProperty(value = "播出端-  pc网页端 移动端mobile")
-    private String os = "pc";
+    private String os;
 
     @TableField("service_provider_")
     @ApiModelProperty(value = "服务提供方 rongCloud tencentCloud")