fix frappe call to update_purchase_receipt_status

changed update_purchase_order_status to update_purchase_receipt_status
diff --git a/erpnext/stock/doctype/purchase_receipt/purchase_receipt.js b/erpnext/stock/doctype/purchase_receipt/purchase_receipt.js
index af29cb8..93f1b08 100644
--- a/erpnext/stock/doctype/purchase_receipt/purchase_receipt.js
+++ b/erpnext/stock/doctype/purchase_receipt/purchase_receipt.js
@@ -151,7 +151,7 @@
 cur_frm.cscript.update_status = function(status) {
 	frappe.ui.form.is_saving = true;
 	frappe.call({
-		method:"erpnext.stock.doctype.purchase_receipt.purchase_receipt.update_purchase_order_status",
+		method:"erpnext.stock.doctype.purchase_receipt.purchase_receipt.update_purchase_receipt_status",
 		args: {docname: cur_frm.doc.name, status: status},
 		callback: function(r){
 			if(!r.exc)