style(cli): fix closing paren indentation in cmd_batch

Whitespace-only ruff format alignment, no functional change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/remove_ai_watermarks/cli.py

@@ -677,7 +677,7 @@ def cmd_batch(
                     seed=seed,
                     hf_token=hf_token,
                     humanize=humanize,
-                    )
+                )
                 processed += 1
 
             except Exception as e: