FullCalander Update Access only works with Nodes

Problem

When using the resize to update functionality the access checks are hard-coded to only work with nodes unless you allow users to update ALL content.

if (!empty($entity) && ((user_access('administer content')
     || user_access('update any fullcalendar event')
     || user_access('edit any ' . $entity->bundle . ' content')
     || (user_access('edit own ' . $entity->bundle . ' content') && $entity->uid == $user->uid)))) {
   return TRUE;
}

Solution

Use the entity_access() function so that access works with all entities.