fix php error for missing Request parameter
fix php error for missing Request parameter

This will be logged on every password change request:
Argument 2 passed to OCA\PasswordPolicy\Controller\PasswordPolicyController::__construct() must implement interface OCP\IRequest, none given, called in [owncloudpath]/apps/passwordpolicy/hooks/passwordpolicyhooks.php on line 17 and defined at [owncloudpath]/apps/passwordpolicy/controller/passwordpolicycontroller.php#13
Undefined variable: request at [owncloudpath]/apps/passwordpolicy/controller/passwordpolicycontroller.php#14
Argument 2 passed to OCP\AppFramework\Controller::__construct() must implement interface OCP\IRequest, null given, called in [owncloudpath]/apps/passwordpolicy/controller/passwordpolicycontroller.php on line 14 and defined at [owncloudpath]/lib/public/appframework/controller.php#62
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