[GDNative] renamed nativearvr to arvr in api.json

modules/gdnative/gdnative_api.json

@@ -5693,8 +5693,8 @@
         }
       ]
     },
-    "nativearvr": {
-      "type": "NATIVEARVR",
+    "arvr": {
+      "type": "ARVR",
       "version": {
         "major": 1,
         "minor": 0