Strict check for file upload error causes failure.

[challgren]

CakePHP 3.7.4
FOC/cakephp-upload 4.0
Apache 2.4.38
PHP 7.2.15
macOS 10.14.3
Apache, PHP, mariaDB installed via HomeBrew

When uploading a file it is expected the file is saved and the database entity is saved. However due to a strict check on Line 90 https://github.com/FriendsOfCake/cakephp-upload/blob/master/src/Model/Behavior/UploadBehavior.php#L90 this code block always trigger because Hash::get((array)$entity->get($field), 'error') returns string '0' (length=1) when the strict check is for int 0 ex define ('UPLOAD_ERR_OK', 0);