Store board collapsed mode user preference in the database

app/Helper/BoardHelper.php

@@ -3,6 +3,7 @@
 namespace Kanboard\Helper;
 
 use Kanboard\Core\Base;
+use Kanboard\Model\UserMetadataModel;
 
 /**
  * Board Helper
@@ -21,6 +22,6 @@ class BoardHelper extends Base
      */
     public function isCollapsed($project_id)
     {
-        return $this->userSession->isBoardCollapsed($project_id);
+        return $this->userMetadataCacheDecorator->get(UserMetadataModel::KEY_BOARD_COLLAPSED.$project_id, 0) == 1;
     }
 }