fix: 修复请求截图api生成文件名称的异常

src/main/java/com/genersoft/iot/vmp/vmanager/gb28181/play/PlayController.java

@@ -359,7 +359,7 @@ public class PlayController {
 		message.setKey(key);
 		message.setId(uuid);
 
-		String fileName = deviceId + "_" + channelId + "_" + DateUtil.getNowForUrl() + "jpg";
+		String fileName = deviceId + "_" + channelId + "_" + DateUtil.getNowForUrl() + ".jpg";
 		playService.getSnap(deviceId, channelId, fileName, (code, msg, data) -> {
 			if (code == InviteErrorCode.SUCCESS.getCode()) {
 				message.setData(data);