Remove useless method (#44)

Author: AdrienVannson

src/betterproto2_compiler/plugin/models.py

@@ -250,14 +250,6 @@ def has_deprecated_fields(self) -> bool:
     def has_oneof_fields(self) -> bool:
         return any(isinstance(field, OneOfFieldCompiler) for field in self.fields)
 
-    @property
-    def has_message_field(self) -> bool:
-        return any(
-            field.proto_obj.type in PROTO_MESSAGE_TYPES
-            for field in self.fields
-            if isinstance(field.proto_obj, FieldDescriptorProto)
-        )
-
     @property
     def custom_methods(self) -> list[str]:
         """