Siwapp: Printing template should return a number with precision specified by the user, don't truncate zeros

Common_Twig_Extension.php

// File location: siwapp/lib/templating/Common_Twig_Extension.php

function common_twig_extension_round($amount, $decimals = 2)
{
  //return round($amount, $decimals);
  return number_format(round($amount, $decimals), $decimals, '.', '');
}