fix: add child button in coa tree (#28413)

diff --git a/erpnext/accounts/doctype/account/account_tree.js b/erpnext/accounts/doctype/account/account_tree.js
index b9ebb58..a3ef384 100644
--- a/erpnext/accounts/doctype/account/account_tree.js
+++ b/erpnext/accounts/doctype/account/account_tree.js
@@ -176,7 +176,7 @@
 					&& node.expandable && !node.hide_add;
 			},
 			click: function() {
-				var me = frappe.treeview_settings['Account'].treeview;
+				var me = frappe.views.trees['Account'];
 				me.new_node();
 			},
 			btnClass: "hidden-xs"