Improve port detection filemanager (hestiacp#2245)

* Improve port detection filemanager

* Adjust spaces

Co-authored-by: Raphael Schneeberger <rs@scit.ch>

Author: jaapmarcus

install/deb/filemanager/filegator/configuration.php

@@ -27,9 +27,11 @@
 
     if (!isset($_SESSION['SFTP_PORT'])) {
         exec("sudo /usr/local/hestia/bin/v-list-sys-sshd-port json", $output, $result);
-        if ($output) {
-            $port=json_decode(implode('', $output));
+        $port=json_decode(implode('', $output));
+        if ( is_numeric($port[0]) && $port[0] > 0 ){
             $_SESSION['SFTP_PORT'] = $port[0];
+        } else if ( preg_match('/^\s*Port\s+(\d+)$/im', file_get_contents('/etc/ssh/sshd_config'), $matches) ) {
+            $_SESSION['SFTP_PORT'] = $matches[1] ?? 22;
         } else {
             $_SESSION['SFTP_PORT'] = 22;
         }