[Migration][Options] set the theme to auto load

Automatically load the theme which fixes issue of it not working correctly when not logged in as reported by @phl0

application/config/migration.php

@@ -21,7 +21,7 @@ $config['migration_enabled'] = TRUE;
 | be upgraded / downgraded to.
 |
 */
-$config['migration_version'] = 85;
+$config['migration_version'] = 86;
 
 /*
 |--------------------------------------------------------------------------

application/migrations/086_options_autoload_theme.php

@@ -0,0 +1,24 @@
+<?php
+
+defined('BASEPATH') OR exit('No direct script access allowed');
+
+/*
+    Creates column public_slug in table station_logbooks
+*/
+
+class Migration_options_autoload_theme extends CI_Migration {
+
+    public function up()
+    {
+        $this->db->set('autoload', 'yes');
+        $this->db->where('option_name', "theme");
+        $this->db->update('options');
+    }
+
+    public function down()
+    {
+        $this->db->set('autoload', 'no');
+        $this->db->where('option_name', "theme");
+        $this->db->update('options');
+    }
+}