Fix NaKrul book sequence

Source/diablo.cpp

@@ -3356,6 +3356,7 @@ tl::expected<void, std::string> LoadGameLevel(bool firstflag, lvl_entry lvldir)
 	LoadGameLevelStopMusic(neededTrack);
 	LoadGameLevelResetCursor();
 	SetRndSeedForDungeonLevel();
+	NaKrulTomeSequence = 0;
 
 	IncProgress();
 

Source/objects.cpp

@@ -58,6 +58,7 @@ int AvailableObjects[MAXOBJECTS];
 int ActiveObjects[MAXOBJECTS];
 int ActiveObjectCount;
 bool LoadingMapObjects;
+int NaKrulTomeSequence;
 
 namespace {
 
@@ -115,9 +116,6 @@ object_graphic_id ObjFileList[40];
 int leverid;
 int numobjfiles;
 
-/** Tracks progress through the tome sequence that spawns Na-Krul (see OperateNakrulBook()) */
-int NaKrulTomeSequence;
-
 /** Specifies the X-coordinate delta between barrels. */
 int bxadd[8] = { -1, 0, 1, -1, 1, -1, 0, 1 };
 /** Specifies the Y-coordinate delta between barrels. */

Source/objects.h

@@ -287,6 +287,8 @@ extern int ActiveObjects[MAXOBJECTS];
 extern int ActiveObjectCount;
 /** @brief Indicates that objects are being loaded during gameplay and pre calculated data should be updated. */
 extern bool LoadingMapObjects;
+/** Tracks progress through the tome sequence that spawns Na-Krul (see OperateNakrulBook()) */
+extern int NaKrulTomeSequence;
 
 /**
  * @brief Find an object given a point in map coordinates