fix: label the items table in the supplier selection dialog

The grid template always renders its label line, so leaving the table unlabelled
left an empty line hanging above the description.

(cherry picked from commit 2e72846670)

erpnext/stock/doctype/material_request/material_request.js

@@ -474,6 +474,7 @@ frappe.ui.form.on("Material Request", {
 				{
 					fieldname: "items",
 					fieldtype: "Table",
+					label: __("Items"),
 					cannot_add_rows: true,
 					cannot_delete_rows: true,
 					in_place_edit: true,