Bug on leads CSV export

Hi,

Tested version : 2.3.4 & 2.6.0

First of all, thank’s for your work on this plugin.

There’s a bug on leads CSV export. CF7 fields like select or checkboxes are missing in the export. In class-wpcf7r-leads-manager.php file (line 142), this condition make trouble :

if ( ! is_array( $value ) && '_' !== substr( $custom_field_key, 0, 1 ) ) {
    $forms[ $form_id ]['leads'][ $lead->ID ][ $custom_field_key ] = $value;
    $forms[ $form_id ]['headers'][ $custom_field_key ] = $custom_field_key;
}

Could you fix this issue please ?

Thank’s.