fix `Notification is not defined` on Android Webview or under ios16.4

Kairlec

2023-04-23 ea3f899593f47c1c6fe708495af0a091a3c73d5f

 src/main/java/com/genersoft/iot/vmp/gb28181/bean/WvpSipDate.java

@@ -10,6 +10,11 @@
 */
public class WvpSipDate extends SIPDate {

    /**
     *
     */
    private static final long serialVersionUID = 1L;
    
    private Calendar javaCal;

    public WvpSipDate(long timeMillis) {