Contacts: fix add contact icon path

apps/contacts/templates/index.php

@@ -9,7 +9,7 @@
 	</div>
 	<div id="bottomcontrols">
 		<form>
-			<button class="svg" id="contacts_newcontact" title="<?php echo $l->t('Add Contact'); ?>"><img class="svg" src="<?php echo OCP\Util::linkTo('contacts', 'img/contact-new.svg'); ?>" alt="<?php echo $l->t('Add Contact'); ?>"   /></button>
+			<button class="svg" id="contacts_newcontact" title="<?php echo $l->t('Add Contact'); ?>"><img class="svg" src="<?php echo OCP\Util::imagePath('contacts', 'contact-new.svg'); ?>" alt="<?php echo $l->t('Add Contact'); ?>"   /></button>
 			<button class="svg" id="chooseaddressbook" title="<?php echo $l->t('Addressbooks'); ?>"><img class="svg" src="core/img/actions/settings.svg" alt="<?php echo $l->t('Addressbooks'); ?>" /></button>
 		</form>
 	</div>