fix: remove unused interface

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

lib/Service/IdentifyMethod/AbstractIdentifyMethod.php

@@ -18,7 +18,6 @@
 use OCA\Libresign\Exception\LibresignException;
 use OCA\Libresign\Helper\JSActions;
 use OCA\Libresign\Service\IdentifyMethod\SignatureMethod\AbstractSignatureMethod;
-use OCA\Libresign\Service\IdentifyMethod\SignatureMethod\ISignatureMethod;
 use OCA\Libresign\Service\SessionService;
 use OCP\IUser;
 use Wobeto\EmailBlur\Blur;