Fix required for Deprecation warning

The plugin throws a warning on modern versions of php:

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; WP_Categories_to_Tags has a deprecated constructor in /path/to/wordpress/wp-content/plugins/wpcat2tag-importer/wpcat2tag-importer.php on line 31

The fix is trivial, on line 483 in wpcat2tag-importer.php change:

function WP_Categories_to_Tags() {
    // Do nothing.
}

to:

function __construct() {
    // Do nothing.
}

or, better yet, simply delete lines 483-485, since they very clearly “do nothing”. ??