remove dead code per TODO

src/poetry/json/__init__.py

@@ -42,13 +42,9 @@ def validate_object(obj: dict[str, Any]) -> list[str]:
         Path(CORE_SCHEMA_DIR, "poetry-schema.json").read_text(encoding="utf-8")
     )
 
-    if core_schema["additionalProperties"]:
-        # TODO: make this un-conditional once core update to >1.1.0b2
-        properties = {*schema["properties"].keys(), *core_schema["properties"].keys()}
-        additional_properties = set(obj.keys()) - properties
-        for key in additional_properties:
-            errors.append(
-                f"Additional properties are not allowed ('{key}' was unexpected)"
-            )
+    properties = {*schema["properties"].keys(), *core_schema["properties"].keys()}
+    additional_properties = set(obj.keys()) - properties
+    for key in additional_properties:
+        errors.append(f"Additional properties are not allowed ('{key}' was unexpected)")
 
     return errors