Revert "add mailinglistAddr to getJson"

This reverts commit 5a4b12c914.

node/lib/chat.ts

@@ -92,7 +92,6 @@ export class Chat {
       color: this.color,
       id: this.getId(),
       name: this.getName(),
-      mailinglistAddr: this.getMailinglistAddr(),
       profileImage: this.getProfileImage(),
       type: this.getType(),
       isSelfTalk: this.isSelfTalk(),

node/lib/types.ts

@@ -12,7 +12,6 @@ export interface ChatJSON {
   color: string
   id: number
   name: string
-  mailinglistAddr: string,
   profileImage: string
   type: number
   isSelfTalk: boolean