CustomXX field in views does not work when XX >= 10

Hi,

Custom field (ga:customVarNameXX, etc.) in views is ignored when XX >= 10.
This is due to the following code.

In google_analytics_reports.module

function google_analytics_reports_variable_to_custom_field($field) {
  return preg_replace('/\d/', 'XX', $field);
}

To fix

function google_analytics_reports_variable_to_custom_field($field) {
  return preg_replace('/\d+/', 'XX', $field);
}