Correct Nav type for WMO objects (#18364)

* Tools/MMaps: Correct liquid type for WMO objects

* MMaps: Update version to 6

src/common/Collision/Maps/MapDefines.h

@@ -5,7 +5,7 @@
 #include "DetourNavMesh.h"
 
 const uint32 MMAP_MAGIC = 0x4d4d4150; // 'MMAP'
-#define MMAP_VERSION 5
+#define MMAP_VERSION 6
 
 struct MmapTileHeader
 {

src/tools/mmaps_generator/MapBuilder.cpp

@@ -27,7 +27,7 @@
 #include <limits.h>
 
 #define MMAP_MAGIC 0x4d4d4150   // 'MMAP'
-#define MMAP_VERSION 5
+#define MMAP_VERSION 6
 
 struct MmapTileHeader
 {

src/tools/mmaps_generator/TerrainBuilder.cpp

@@ -710,7 +710,7 @@ namespace MMAP
                         uint8 type = NAV_EMPTY;
 
                         // convert liquid type to NavTerrain
-                        switch (liquid->GetType())
+                        switch (liquid->GetType() & 3)
                         {
                         case 0:
                         case 1: