Revert "Always save pages/covers in subfolders"

This reverts commit 8568d5d6c3.

Closes #10052

app/src/main/java/eu/kanade/presentation/more/settings/screen/SettingsReaderScreen.kt

@@ -347,6 +347,11 @@ object SettingsReaderScreen : SearchableSettings {
                     pref = readerPreferences.readWithLongTap(),
                     title = stringResource(R.string.pref_read_with_long_tap),
                 ),
+                Preference.PreferenceItem.SwitchPreference(
+                    pref = readerPreferences.folderPerManga(),
+                    title = stringResource(R.string.pref_create_folder_per_manga),
+                    subtitle = stringResource(R.string.pref_create_folder_per_manga_summary),
+                ),
             ),
         )
     }