claudetool: add missing continue

This caused confusing double error messages from the tool.
diff --git a/claudetool/patch.go b/claudetool/patch.go
index fb04319..7a6dc6f 100644
--- a/claudetool/patch.go
+++ b/claudetool/patch.go
@@ -239,6 +239,7 @@
 			case 2:
 				// multiple matches
 				patchErr = errors.Join(patchErr, fmt.Errorf("old text not unique:\n%s", patch.OldText))
+				continue
 			default:
 				// TODO: return an error instead of using agentPatch
 				slog.ErrorContext(ctx, "unique returned unexpected count", "count", count)