TT#144000 fix /api/ncoslnpcarriers rail

the form used for the /api/ncoslnpcarriers rail
uses the same technique to expose a JSON field
"carrier_id" for the table column "lnp_provider_id",
also found in the /api/lnpnumbers rail implementation.

it however did not work until now, because the
fieldname in the render_list did not match.

Change-Id: I45dca22bab73e16b538de7ea1d540aa1383fb56d

lib/NGCP/Panel/Form/NCOS/LnpAPI.pm

@@ -15,7 +15,7 @@ has_field 'ncos_level_id' => (
 has_block 'fields' => (
     tag => 'div',
     class => [qw/modal-body/],
-    render_list => [qw/description ncos_level_id lnp_provider_id/],
+    render_list => [qw/description ncos_level_id /],
 );
 
 1;