fix: remove isFinite comment

ts/session/messages/outgoing/ExpirableMessage.ts

@@ -33,7 +33,6 @@ export class ExpirableMessage extends ContentMessage {
           : this.expirationType === 'legacy'
           ? SignalService.Content.ExpirationType.UNKNOWN
           : undefined,
-      // TODO could use isFinite?
       expirationTimer: this.expireTimer && this.expireTimer > -1 ? this.expireTimer : undefined,
     });
   }