[IMP] mail: defaultDisplayMode can be directly assigned

Part-of: odoo/odoo#115945

addons/mail/static/src/core/thread_service.js

@@ -482,6 +482,7 @@ export class ThreadService {
                 "state",
                 "group_based_subscription",
                 "last_interest_dt",
+                "defaultDisplayMode",
             ]);
             if (thread.model === "mail.channel" && serverData.channel) {
                 thread.channel = assignDefined(thread.channel ?? {}, serverData.channel);
@@ -494,9 +495,6 @@ export class ThreadService {
             if ("seen_message_id" in serverData) {
                 thread.serverLastSeenMsgBySelf = serverData.seen_message_id;
             }
-            if ("defaultDisplayMode" in serverData) {
-                thread.defaultDisplayMode = serverData.defaultDisplayMode;
-            }
             if ("rtc_inviting_session" in serverData) {
                 this.env.bus.trigger("THREAD-SERVICE:UPDATE_RTC_SESSIONS", {
                     thread,