Delay the deletion of esm versions after the deletion of the scene as it is used in one of its workers (the objectpaging one)

apps/openmw/mwworld/worldimp.hpp

@@ -91,6 +91,7 @@ namespace MWWorld
         MWWorld::Globals mGlobalVariables;
         Misc::Rng::Generator mPrng;
         Cells mCells;
+        std::vector<int> mESMVersions; // the versions of esm files
 
         std::string mCurrentWorldSpace;
 
@@ -138,8 +139,6 @@ namespace MWWorld
 
         float mSimulationTimeScale = 1.0;
 
-        std::vector<int> mESMVersions; // the versions of esm files
-
         // not implemented
         World(const World&);
         World& operator=(const World&);