refactor(map): 移除未使用的预置体实例并重新映射组件ID

清理地图预置体文件，删除未引用的预置体实例（mskills节点）及其相关覆盖属性。
同时调整剩余组件的内部引用ID，保持文件结构一致性。

assets/resources/game/map/map_rpg.prefab

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@@ -2599,7 +2390,7 @@
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@@ -2627,7 +2418,7 @@
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@@ -2768,7 +2559,7 @@
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@@ -2874,7 +2665,7 @@
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