Fix selectize styling

  Replace selectize.min.js with selectize.js
  https://github.com/brianreavis/selectize.js/commit/dfcdf60b7ac5ac5bf25e01053249bf214fcpublic/js/selectize.min.jsa6ed5

  Seems like the new version does not use "display: inline-block"
  which then does not add extra spacing under the selectize div.

  Instead it has the default styling for a div which is block.
  This does not go well with the current help text, but I don't care
  now, since it will not matter with the new settings page (which is not
  yet created) which use the same form styling as the register/wizard
  forms.