Core/Scripts: Fixed calling UnitScript hooks

Closes #16543

(cherry picked from commit f809e5e13eac66add49d361ffb1634ff2ba6d4aa)

src/server/game/Scripting/ScriptMgr.h

@@ -843,10 +843,7 @@ class GroupScript : public ScriptObject
 
 // namespace
 // {
-    typedef std::vector<ScriptObject*> UnusedScriptContainer;
     typedef std::list<std::string> UnusedScriptNamesContainer;
-
-    extern UnusedScriptContainer UnusedScripts;
     extern UnusedScriptNamesContainer UnusedScriptNames;
 // }
 
@@ -878,7 +875,6 @@ class ScriptMgr
     public: /* Unloading */
 
         void Unload();
-        void UnloadUnusedScripts();
 
     public: /* SpellScriptLoader */