Fix bug where edited transaction "forgets" customer on save

pages/pos.php

@@ -34,6 +34,7 @@ if (isset($_GET['switch']) || !isset($_SESSION['register']) || !$registeropen) {
             $editing = true;
             $payments = $database->select('payments', ['[>]certificates' => 'certid', '[>]payment_types' => ['type' => 'typeid']], ['payments.amount', 'typename', 'icon', 'text', 'certcode'], ['txid' => $tx['txid']]);
             echo "<input type=\"hidden\" id=\"txid\" value=\"$tx[txid]\">";
+            echo "<input type=\"hidden\" id=\"edit_customerid\" value=\"$tx[customerid]\">";
         } else {
             $returning = true;
             echo "<input type=\"hidden\" id=\"return\" value=\"1\">";

static/js/pos_customer.js

@@ -9,6 +9,12 @@ var customername = "";
 var customeremail = "";
 var customerphone = "";
 
+$(document).ready(function () {
+    if ($("#edit_customerid").length) {
+        customerid = $("#edit_customerid").val();
+    }
+});
+
 function showCustomerList(search) {
     if (search == "") {
         return;