TT#4334 remove duplicate column package_id

this rendered package_id twice in the API documentation

Change-Id: Iad1e9c80ad47c90f3addfee058deb054830ceadf

lib/NGCP/Panel/Form/Voucher/ResellerAPI.pm

@@ -60,15 +60,6 @@ has_field 'package_id' => (
     },
 );
 
-has_field 'package' => (
-    type => '+NGCP::Panel::Field::ProfilePackage',
-    #required => 1,
-    element_attr => {
-        rel => ['tooltip'],
-        title => ['The profile package the customer will switch with the top-up.']
-    },
-);
-
 sub validate_valid_until {
     my ($self, $field) = @_;