Bug 28103: Fix barcode plugin on the order receive view

Fix the following error:
Uncaught TypeError: Cannot read property 'field_value' of null

Test plan:
Set "AcqCreateItem" to "receiving an order"
Set "autoBarcode" to "generated in the form <branchcode>yymm0001"

Create an order and go to receive it at a path like
/cgi-bin/koha/acqui/orderreceive.pl?ordernumber=2&invoiceid=1

Click on the barcode input and confirm that it's prefilled
automatically

Signed-off-by: Owen Leonard <oleonard@myacpl.org>

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

koha-tmpl/intranet-tmpl/prog/en/modules/acqui/orderreceive.tt

@@ -46,7 +46,7 @@
 <h1>Receive items from : [% name | html %] [% IF ( invoice ) %][[% invoice | html %]] [% END %] (order #[% order.ordernumber | html %])</h1>
 
 [% IF ( order ) %]
-    <form action="/cgi-bin/koha/acqui/finishreceive.pl" class="noEnterSubmit" method="post" onsubmit="return Check(this);">
+    <form id="f" action="/cgi-bin/koha/acqui/finishreceive.pl" class="noEnterSubmit" method="post" onsubmit="return Check(this);">
 <div class="row">
 <div class="col-sm-6">
     <div class="dialog alert order_error" style="display:none"></div>