voting-server: remove optional arguments
voting-server: remove optional arguments

Signed-off-by: Nuno Azevedo <8c1e4f9df2ead62a44323c12422702b1d8dd9c90@gmail.com>

joaolrpaulo/eletronic-voting-system,joaolrpaulo/eletronic-voting-system,joaolrpaulo/eletronic-voting-system