Added term meta table to default tables to copy

[WazzaJB]

Pretty self explanatory, term meta tables were introduced in 4.4 and need to be included in default imports.

Really pleased with this plugin, thanks all involved.

As a sidenote, anyone looking to get term meta support in the mean time can just add the following in a PHP file within wp-content/mu-plugins:

/**
 * Modify Multisite Duplicator to include term meta table
 */
add_filter('mucd_default_primary_tables_to_copy', 'add_additional_duplicate_tables');
function add_additional_duplicate_tables($tables) {
    $tables[] = 'termmeta';
    return $tables;
}