TT#153950 Add label 'Invoice Template' to Invoice create page

Otherwise the table is not signed at all on create 'Invoice' page.

Change-Id: Idea6ab1df49b5de9db1b469fb872d031378bf3a4

lib/NGCP/Panel/Field/InvoiceTemplate.pm

@@ -4,7 +4,7 @@ extends 'HTML::FormHandler::Field::Compound';
 
 has_field 'id' => (
     type => '+NGCP::Panel::Field::DataTable',
-    label => '',
+    label => 'Invoice Template',
     do_label => 0,
     do_wrapper => 0,
     required => 1,