fix: sorting by date

Author: Thundernerd

src/Mangarr.Stack/Library/LibraryApi.cs

@@ -64,7 +64,7 @@ public List<ContentItemModel> GetSortedLibrary()
                 orderedItems = items.OrderBy(x => x.Manga.DateCreated);
                 break;
             case LibrarySortMode.Updated:
-                orderedItems = items.OrderBy(x => x.Chapters.OrderBy(y => y.DateCreated).Last());
+                orderedItems = items.OrderBy(x => x.Chapters.OrderBy(y => y.DateCreated).Last().DateCreated);
                 break;
             case LibrarySortMode.Source:
                 orderedItems = items.OrderBy(x => x.Source?.Name ?? string.Empty);