correction, let's keep source in ctx

Author: AlbertDeFusco

pydantic_settings/main.py

@@ -428,6 +428,9 @@ def _settings_build_values(
                             if line.get("type", "") == "missing":
                                 continue
                             line['loc'] = [source_name] + line['loc']
+                            ctx = line.get("ctx", {})
+                            ctx["source"] = source_name
+                            line['ctx'] = ctx
                             details = InitErrorDetails(**line)
                             all_line_errors.append(details)