fix(dbc): correct ItemDisplayInfo texture field indices for TBC/WotLK

TBC and WotLK have 25-field ItemDisplayInfo.dbc (vs 23 in Classic/Turtle)
with 2 extra fields before the texture region block. The texture fields
start at index 15 (not 14), shifting all 8 regions by +1.

This caused every equipment texture to be composited into the wrong body
region — e.g. LegLower textures landing in FootTexture, belt textures in
LegLowerTexture instead of LegUpperTexture ("everything shifted by 1").

Verified against raw DBC binary data: Classic field[14]=ArmUpper,
TBC/WotLK field[15]=ArmUpper.

Data/expansions/tbc/dbc_layouts.json

@@ -119,14 +119,14 @@
     "InventoryIcon": 5,
     "LeftModel": 1,
     "LeftModelTexture": 3,
-    "TextureArmLower": 15,
-    "TextureArmUpper": 14,
-    "TextureFoot": 21,
-    "TextureHand": 16,
-    "TextureLegLower": 20,
-    "TextureLegUpper": 19,
-    "TextureTorsoLower": 18,
-    "TextureTorsoUpper": 17
+    "TextureArmLower": 16,
+    "TextureArmUpper": 15,
+    "TextureFoot": 22,
+    "TextureHand": 17,
+    "TextureLegLower": 21,
+    "TextureLegUpper": 20,
+    "TextureTorsoLower": 19,
+    "TextureTorsoUpper": 18
   },
   "ItemSet": {
     "ID": 0,

Data/expansions/wotlk/dbc_layouts.json

@@ -131,14 +131,14 @@
     "InventoryIcon": 5,
     "LeftModel": 1,
     "LeftModelTexture": 3,
-    "TextureArmLower": 15,
-    "TextureArmUpper": 14,
-    "TextureFoot": 21,
-    "TextureHand": 16,
-    "TextureLegLower": 20,
-    "TextureLegUpper": 19,
-    "TextureTorsoLower": 18,
-    "TextureTorsoUpper": 17
+    "TextureArmLower": 16,
+    "TextureArmUpper": 15,
+    "TextureFoot": 22,
+    "TextureHand": 17,
+    "TextureLegLower": 21,
+    "TextureLegUpper": 20,
+    "TextureTorsoLower": 19,
+    "TextureTorsoUpper": 18
   },
   "ItemSet": {
     "ID": 0,