android: arcel the serverURL in the Android SDK

In the Android SDK, the setServerURL option is erroneously
ignored. The meeting's serverURL always defaults to
https://meet.jit.si because the serverURL is not parceled.

android/sdk/src/main/java/org/jitsi/meet/sdk/JitsiMeetConferenceOptions.java

     }
 
     private JitsiMeetConferenceOptions(Parcel in) {
+        serverURL = (URL) in.readSerializable();
         room = in.readString();
         subject = in.readString();
         token = in.readString();
 
     @Override
     public void writeToParcel(Parcel dest, int flags) {
+        dest.writeSerializable(serverURL);
         dest.writeString(room);
         dest.writeString(subject);
         dest.writeString(token);