Fix sort by date in LibraryPresenter (#8137) (#8145)

Co-authored-by: Alessandro Tedesco <[email protected]>

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryPresenter.kt

@@ -390,7 +390,7 @@ class LibraryPresenter(
                     manga1chapterFetchDate.compareTo(manga2chapterFetchDate)
                 }
                 LibrarySort.Type.DateAdded -> {
-                    i1.libraryManga.manga.dateAdded.compareTo(i1.libraryManga.manga.dateAdded)
+                    i1.libraryManga.manga.dateAdded.compareTo(i2.libraryManga.manga.dateAdded)
                 }
                 else -> throw IllegalStateException("Invalid SortModeSetting: ${sort.type}")
             }