r006: Add unraid_system_shell to WebGUI tool groups + update counts

scripts/mua.page

@@ -180,6 +180,7 @@ $tool_groups = [
     ],
     'System' => [
         'unraid_system_connection_test',
+        'unraid_system_shell',
     ],
 ];
 ?>
@@ -282,7 +283,7 @@ $tool_groups = [
 <tr><th>Port (MCP)</th><td><?= $port ?></td></tr>
 <tr><th>Port (Config)</th><td><?= $config_port ?> (nur localhost)</td></tr>
 <tr><th>Host-IP</th><td><?= $host_ip ?></td></tr>
-<tr><th>Tools</th><td><?= count($all_tools) ?: 21 ?> (Docker: 14, Netzwerk: 6, System: 1)</td></tr>
+<tr><th>Tools</th><td><?= count($all_tools) ?: 22 ?> (Docker: 14, Netzwerk: 6, System: 2)</td></tr>
 <tr><th>Plugin-Verzeichnis</th><td><code><?= $plugin_dir ?></code></td></tr>
 <tr><th>Service</th><td><code>/etc/rc.d/rc.mua</code> (SysVinit)</td></tr>
 </table>