include expireTimer in group invitation message so it does not reset it

js/models/conversations.js

@@ -1285,6 +1285,7 @@
                 serverName: groupInvitation.name,
                 channelId: groupInvitation.channelId,
                 serverAddress: groupInvitation.address,
+                expireTimer: this.get('expireTimer'),
               }
             );
 

ts/session/messages/outgoing/content/data/GroupInvitationMessage.ts

@@ -7,18 +7,23 @@ interface GroupInvitationMessageParams extends MessageParams {
   serverAddress: string;
   channelId: number;
   serverName: string;
+  // if there is an expire timer set for the conversation, we need to set it.
+  // otherwise, it will disable the expire timer on the receiving side.
+  expireTimer?: number;
 }
 
 export class GroupInvitationMessage extends DataMessage {
   private readonly serverAddress: string;
   private readonly channelId: number;
   private readonly serverName: string;
+  private readonly expireTimer?: number;
 
   constructor(params: GroupInvitationMessageParams) {
     super({ timestamp: params.timestamp, identifier: params.identifier });
     this.serverAddress = params.serverAddress;
     this.channelId = params.channelId;
     this.serverName = params.serverName;
+    this.expireTimer = params.expireTimer;
   }
 
   public ttl(): number {
@@ -32,8 +37,10 @@ export class GroupInvitationMessage extends DataMessage {
       serverName: this.serverName,
     });
 
+
     return new SignalService.DataMessage({
       groupInvitation,
+      expireTimer: this.expireTimer,
     });
   }
 }