Move DisplayPreferencesManager.cs to Users namespace

Jellyfin.Server.Implementations/Users/DisplayPreferencesManager.cs

@@ -3,7 +3,7 @@ using System.Linq;
 using Jellyfin.Data.Entities;
 using MediaBrowser.Controller;
 
-namespace Jellyfin.Server.Implementations
+namespace Jellyfin.Server.Implementations.Users
 {
     /// <summary>
     /// Manages the storage and retrieval of display preferences through Entity Framework.

MediaBrowser.Api/DisplayPreferencesService.cs

@@ -148,7 +148,7 @@ namespace MediaBrowser.Api
 
             foreach (var key in request.CustomPrefs.Keys.Where(key => key.StartsWith("homesection")))
             {
-                var order = int.Parse(key.Substring("homesection".Length));
+                var order = int.Parse(key.AsSpan().Slice("homesection".Length));
                 if (!Enum.TryParse<HomeSectionType>(request.CustomPrefs[key], true, out var type))
                 {
                     type = order < 7 ? defaults[order] : HomeSectionType.None;