fix: 适配于1.65以下版本

AddSort中所引用的变量，在小于1.65的版本中为`_categorySortSetting`，没有`_before`前缀。

Author: Starrah

AquaMai.Mods/GameSystem/SongConstantSort.cs

@@ -164,18 +164,18 @@ public static bool GetEnumValue(DB.SortTabID self, ref int __result)
     [HarmonyPatch]
     public static class NavigationPatches
     {
-        private static readonly FieldInfo _beforeSortField =
-            typeof(Process.MusicSelectProcess).GetField("_beforeCategorySortSetting",
+        private static readonly FieldInfo _sortField =
+            typeof(Process.MusicSelectProcess).GetField(GameInfo.GameVersion >= 26500 ? "_beforeCategorySortSetting" : "_categorySortSetting",
                 BindingFlags.NonPublic | BindingFlags.Instance);
 
         [HarmonyPatch(typeof(Process.MusicSelectProcess), "AddSort")]
         [HarmonyPrefix]
         public static bool AddSort_Prefix(Process.MusicSelectProcess __instance, DB.SortRootID root)
         {
             if (root != DB.SortRootID.Tab) return true;
-            int next = (int)(DB.SortTabID)_beforeSortField.GetValue(__instance) + 1;
+            int next = (int)(DB.SortTabID)_sortField.GetValue(__instance) + 1;
             if (next >= ConstTabId.End) next = ConstTabId.Value;
-            _beforeSortField.SetValue(__instance, (DB.SortTabID)next);
+            _sortField.SetValue(__instance, (DB.SortTabID)next);
             return false;
         }
     }