Grab active php cli version instead hardcoded.

web/inc/main.php

@@ -4,7 +4,7 @@ session_start();
 
 define('HESTIA_CMD', '/usr/bin/sudo /usr/local/hestia/bin/');
 define('JS_LATEST_UPDATE', '1491697868');
-define('DEFAULT_PHP_VERSION', 'php-7.3');
+define('DEFAULT_PHP_VERSION', "php-" . exec('php -r "echo (float)phpversion();"'));
 
 $i = 0;