update public_path for FM config

install/deb/filemanager/filegator/configuration.php

@@ -2,6 +2,7 @@
 
 $dist_config = require __DIR__.'/configuration_sample.php';
 
+$dist_config['public_path'] = '/fm/';
 $dist_config['frontend_config']['app_name'] = 'Hestia FM';
 $dist_config['frontend_config']['logo'] = 'https://raw.githubusercontent.com/filegator/filegator/master/dist/img/logo.png';
 $dist_config['frontend_config']['editable'] = ['.txt', '.css', '.js', '.ts', '.html', '.php', '.py' ];