renamed data attribute name used to find frames

lib/single-file/single-file-helper.js

@@ -28,7 +28,7 @@ this.singlefile.lib.helper = this.singlefile.lib.helper || (() => {
 	const REMOVED_CONTENT_ATTRIBUTE_NAME = "data-single-file-removed-content";
 	const PRESERVED_SPACE_ELEMENT_ATTRIBUTE_NAME = "data-single-file-preserved-space-element";
 	const SHADOW_ROOT_ATTRIBUTE_NAME = "data-single-file-shadow-root-element";
-	const WIN_ID_ATTRIBUTE_NAME = "data-frame-tree-win-id";
+	const WIN_ID_ATTRIBUTE_NAME = "data-single-file-win-id";
 	const IMAGE_ATTRIBUTE_NAME = "data-single-file-image";
 	const POSTER_ATTRIBUTE_NAME = "data-single-file-poster";
 	const CANVAS_ATTRIBUTE_NAME = "data-single-file-canvas";