MT#57171 speedup DELETE /api/lnpnumbers/id

Change-Id: I2b3f817b95e311b922e935453f659893004c5be4

lib/NGCP/Panel/Controller/API/LnpNumbersItem.pm

@@ -121,7 +121,7 @@ sub DELETE :Allow {
     {
         my $item = $self->item_by_id($c, $id);
         last unless $self->resource_exists($c, lnpnumber => $item);
-        $item->delete;
+        $c->model('DB')->resultset('lnp_numbers')->search_rs({ id => $id, },undef)->delete();
 
         $guard->commit;