fix(UI): Do not re-compute the container width when chat window is closed.

Since the external API now sets preferredWidth/preferredHeight for resizing the large video, we don't need to add chat width to the computed window width when the chat window is closed.
Fixes https://github.com/jitsi/jitsi-meet/issues/7889

modules/UI/videolayout/LargeVideoManager.js

         let widthToUse = this.preferredWidth || window.innerWidth;
         const { isOpen } = APP.store.getState()['features/chat'];
 
-        /**
-         * If chat state is open, we re-compute the container width by subtracting the default width of
-         * the chat. We re-compute the width again after the chat window is closed. This is needed when
-         * custom styling is configured on the large video container through the iFrame API.
-         */
-        if (isOpen && !this.resizedForChat) {
+        if (isOpen) {
+            /**
+             * If chat state is open, we re-compute the container width
+             * by subtracting the default width of the chat.
+             */
             widthToUse -= CHAT_SIZE;
-            this.resizedForChat = true;
-        } else if (this.resizedForChat) {
-            this.resizedForChat = false;
-            widthToUse += CHAT_SIZE;
         }
 
         this.width = widthToUse;