installer: forcefully set uid to 0 for installer user

cc @fichtner

src/etc/rc.subr.d/livemode

@@ -52,7 +52,7 @@ function sync_installer_user()
         $installer->setNodes($root->getNodeContent());
         $installer->descr = 'System Installer';
         $installer->name = 'installer';
-        $installer->uid = '0'; /* needs a reset */
+        $installer->uid->updateValue('0'); /* needs a reset */
 
         if ($usermdl->serializeToConfig(false, true)) {
             Config::getInstance()->save();

src/opnsense/mvc/app/models/OPNsense/Auth/FieldTypes/UidField.php

@@ -68,6 +68,15 @@ class UidField extends IntegerField
         }
     }
 
+    /**
+     * (forcefully) update value ignoring default behavior
+     * @param string $value set field value
+     */
+    public function updateValue($value)
+    {
+        parent::setValue($value);
+    }
+
     /**
      * {@inheritdoc}
      */