Make Full HTML the default text format for administrators in the standard install profile (helps compliance with ATAG 2.0)

since in filter.module, the default filter format is the first one available by weight.

function filter_default_format($account = NULL) {
  global $user;
  if (!isset($account)) {
    $account = $user;
  }
  // Get a list of formats for this user, ordered by weight. The first one
  // available is the user's default format.
  $formats = filter_formats($account);
  $format = reset($formats);
  return $format->format;
}

The accessible helper module can fix this by rearranging the weight. The patch to core would do the same by changing the weights in filter.install/filter_install()

This will be in 7.x-1.x-dev in the accessible fixes part of the module.