remove db prefix

Admin/Installer.php

@@ -46,7 +46,7 @@ final class Installer extends InstallerAbstract
     public static function installExternal(DatabasePool $dbPool, array $data) : void
     {
         try {
-            $dbPool->get()->con->query('select 1 from `' . $dbPool->get()->prefix . 'nav`');
+            $dbPool->get()->con->query('select 1 from `nav`');
         } catch (\Exception $e) {
             return;
         }

Models/Navigation.php

@@ -90,7 +90,6 @@ class Navigation
             $this->nav = [];
 
             $query = new Builder($this->dbPool->get('select'));
-            $query->prefix($this->dbPool->get('select')->prefix);
             $sth = $query->select('*')
                 ->from('nav')
                 ->whereIn('nav.nav_pid', $hashes)