fix visualisation of gestao documental in chat.

implemented delete DM messages

src/app/services/chat.service.ts

@@ -190,7 +190,7 @@ export class ChatService {
       let opts = {
         headers: this.headers,
       }
-      return this.http.post(environment.apiChatUrl+'im.close', body, this.options);
+      return this.http.post(environment.apiChatUrl+'im.delete', body, this.options);
     }
 
     createRoom(body:any){