we need to listen to the pre delete hook, otherwise the file is already gone

apps/files_sharing/appinfo/app.php

@@ -12,7 +12,7 @@ OCP\Share::registerBackend('file', 'OC_Share_Backend_File');
 OCP\Share::registerBackend('folder', 'OC_Share_Backend_Folder', 'file');
 OCP\Util::addScript('files_sharing', 'share');
 \OC_Hook::connect('OC_Filesystem', 'post_write', '\OC\Files\Cache\Shared_Updater', 'writeHook');
-\OC_Hook::connect('OC_Filesystem', 'post_delete', '\OC\Files\Cache\Shared_Updater', 'deleteHook');
+\OC_Hook::connect('OC_Filesystem', 'delete', '\OC\Files\Cache\Shared_Updater', 'deleteHook');
 \OC_Hook::connect('OC_Filesystem', 'post_rename', '\OC\Files\Cache\Shared_Updater', 'renameHook');
 \OC_Hook::connect('OCP\Share', 'post_shared', '\OC\Files\Cache\Shared_Updater', 'shareHook');
 \OC_Hook::connect('OCP\Share', 'pre_unshare', '\OC\Files\Cache\Shared_Updater', 'shareHook');