fix(dav): remove unused import in TokenController test

Signed-off-by: Enrique Pérez Arnaud <enrique@cazalla.net>

Author: enriquepablo

apps/dav/tests/unit/Controller/TokenControllerTest.php

@@ -21,7 +21,6 @@
 use OCP\IAppConfig;
 use OCP\IRequest;
 use OCP\Security\ISecureRandom;
-use OCP\Security\Signature\Exceptions\IncomingRequestException;
 use OCP\Security\Signature\Exceptions\SignatoryNotFoundException;
 use OCP\Security\Signature\Exceptions\SignatureException;
 use OCP\Security\Signature\Exceptions\SignatureNotFoundException;