add missing timestamp field for some Outgoing messages

js/background.js

@@ -1391,10 +1391,11 @@
         pubKey
       );
       await window.lokiFileServerAPI.updateOurDeviceMapping();
-      // TODO: we should ensure the message was sent and retry automatically if not
       const device = new libsession.Types.PubKey(pubKey);
       const unlinkMessage = new libsession.Messages.Outgoing.DeviceUnlinkMessage(
-        pubKey
+        {
+          timestamp: Date.now(),
+        }
       );
 
       await libsession.getMessageQueue().send(device, unlinkMessage);

js/models/conversations.js

@@ -1382,7 +1382,7 @@
             const groupInvitMessage = new libsession.Messages.Outgoing.GroupInvitationMessage(
               {
                 identifier: id,
-
+                timestamp: Date.now(),
                 serverName: groupInvitation.name,
                 channelId: groupInvitation.channelId,
                 serverAddress: groupInvitation.address,

libtextsecure/sendmessage.js

@@ -458,6 +458,7 @@ MessageSender.prototype = {
     if (myDevice !== 1 && myDevice !== '1') {
       const syncReadMessages = new libsession.Messages.Outgoing.SyncReadMessage(
         {
+          timestamp: Date.now(),
           readMessages: reads,
         }
       );