Wrong var used in theme_hues_css_clear_files()

When trying to update a a setting in theme_hues/configure the site shows a warning about passing an array as string in theme_hues_css_clear_files() as its passing $files instead of $file to the file delete function..

/**
 *
 * Delete all CSS files from our directory.
 */
function theme_hues_css_clear_files() {
  $dir = _theme_hues_css_dirpath();

  $files = glob("$dir/*.css");
  foreach ($files as $file) {
    file_unmanaged_delete("$dir/$files");
  }
}

file_unmanaged_delete should be:

 file_unmanaged_delete("$dir/$file");