Fix Warning PHP

[Emi912]

setcookie(): Passing null to parameter #5 ($domain) of type string is deprecated
in setcookie called at /var/application/app-src/vendor/dailymotion/sdk/Dailymotion.php (767)

setcookie($cookieName, $value, $expires, '/', $this->cookieDomain);

Fix warning

public $cookieDomain = null;

change to

public $cookieDomain = "";