Revert "Dont dump legacy fields (#2241)" (#2259)

This reverts commit 97eba1eecc.

script/api_protobuf/api_protobuf.py

@@ -183,8 +183,6 @@ class TypeInfo:
 
     @property
     def dump_content(self):
-        if self.name.startswith("legacy_"):
-            return None
         o = f'out.append("  {self.name}: ");\n'
         o += self.dump(f"this->{self.field_name}") + "\n"
         o += f'out.append("\\n");\n'