Fixed width of edit scheduled post UI (#31196)

webapp/channels/src/components/drafts/scheduled_post_list/scheduled_post_list.scss

@@ -2,6 +2,7 @@
 // See LICENSE.txt for license information.
 
 .ScheduledPostList {
+    width: 100%;
     height: 100%;
 
     &.nonVirtualizedScheduledPostList {

webapp/channels/src/components/edit_scheduled_post/edit_post.tsx

@@ -262,6 +262,7 @@ const EditPost = ({editingPost, actions, canEditPost, config, channelId, draft,
     const handleEdit = async () => {
         if (scheduledPost) {
             await handleEditScheduledPost();
+            afterSave?.();
             return;
         }