fix: (ux) Add is_group=0 filter on website warehouse (#30396)

- It does not support group warehouses right now and it is misleading
diff --git a/erpnext/e_commerce/doctype/website_item/website_item.js b/erpnext/e_commerce/doctype/website_item/website_item.js
index 741e78f..7108cab 100644
--- a/erpnext/e_commerce/doctype/website_item/website_item.js
+++ b/erpnext/e_commerce/doctype/website_item/website_item.js
@@ -5,6 +5,12 @@
 	onload: function(frm) {
 		// should never check Private
 		frm.fields_dict["website_image"].df.is_private = 0;
+
+		frm.set_query("website_warehouse", () => {
+			return {
+				filters: {"is_group": 0}
+			};
+		});
 	},
 
 	image: function() {