Fix logic uri to url logic to place url_suffix

strlen($suffix) > 4 for two letter .tld, since one symbol plus slash plus point plus two letter tld is 5 (e.g. '.ru/2').
Original issue pointed out when trying to get Route for one-symbol uri, like:
```php
//in config
	'url_suffix'  => '.html',
//in routes.php
	'_root_'  => ['welcome/page', 'name' => 'main_page'],  // The default route
	'(\d{1,})'  =>  ['welcome/page/$1', 'name' => 'page'],  // The default route
// getting route
Router::get('page',['$1'=>9]); // gets URL for 'page' named route with first unnamed param http://domain.tld/9.html
```
Untouched version of uri.php gave wrong result for one-symbol uri (without .suffix)