fix: correct namespace in Tileras json files

src/main/resources/data/ntx4core/custom_portal_generation/cavern.json

@@ -3,7 +3,7 @@
   "from": [
     "minecraft:overworld"
   ],
-  "to": "anvilcraft:cavern",
+  "to": "ntx4core:cavern",
   "form": {
     "type": "imm_ptl:classical",
     "from_frame_block": "minecraft:deepslate",

src/main/resources/data/ntx4core/custom_portal_generation/flat.json

@@ -3,7 +3,7 @@
   "from": [
     "minecraft:overworld"
   ],
-  "to": "anvilcraft:flat",
+  "to": "ntx4core:flat",
   "form": {
     "type": "imm_ptl:classical",
     "from_frame_block": "minecraft:quartz_block",

src/main/resources/data/ntx4core/custom_portal_generation/islands.json

@@ -3,7 +3,7 @@
   "from": [
     "minecraft:overworld"
   ],
-  "to": "anvilcraft:islands",
+  "to": "ntx4core:islands",
   "form": {
     "type": "imm_ptl:classical",
     "from_frame_block": "minecraft:smooth_basalt",

src/main/resources/data/ntx4core/custom_portal_generation/mirror.json

@@ -3,7 +3,7 @@
   "from": [
     "minecraft:overworld"
   ],
-  "to": "anvilcraft:mirror",
+  "to": "ntx4core:mirror",
   "form": {
     "type": "imm_ptl:classical",
     "from_frame_block": "minecraft:amethyst_block",