Remove variants/split partial from orders/shipments partial

In OFN we have one shipment per order so it doesnt make sense to split items between shipments

app/views/spree/admin/orders/_shipment.html.haml

@@ -1,5 +1,4 @@
 %div{ :id => "shipment_#{shipment.id}" }
-  = render :partial => "spree/admin/variants/split", :formats => :js
   %fieldset{ :class => "no-border-bottom" }
     %legend{ :align => "center", :class => "stock-location", "data-hook" => "stock-location" }
       %span{ :class => "shipment-number" }