fix: correct indentation in except block for concise validation errors

The previous commit introduced broken indentation in the except block,
causing a SyntaxError (unmatched ')') that broke all CI checks.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: VascoSch92

openhands-sdk/openhands/sdk/agent/agent.py

@@ -877,12 +877,11 @@ def _get_action_event(
             action: Action = tool.action_from_arguments(arguments)
         except (json.JSONDecodeError, ValidationError, ValueError) as e:
             # Build concise error message with parameter names only (not values)
-keys = list(parsed_args.keys()) if isinstance(parsed_args, dict) else None
-params = (
-    f"Parameters provided: {keys}"
-    if keys is not None
-    else "Arguments: unparseable JSON"
-)
+            keys = list(parsed_args.keys()) if isinstance(parsed_args, dict) else None
+            params = (
+                f"Parameters provided: {keys}"
+                if keys is not None
+                else "Arguments: unparseable JSON"
             )
             err = f"Error validating tool '{tool.name}': {e}. {params}"
             # Persist assistant function_call so next turn has matching call_id