Better Default meta for false

When you create a new post or uncheck the value the metadata stays with the meta_key ‘cybocfi_hide_featured_image’ and a empty meta_value. I think either filling out the value as ‘no’ or false (0) might make it more clear. Or even better would be to just remove the row from the db completely, as its means less rows in the postmeta table, which could lead to better performance for sites with lots of posts.