fix typo yield vs yield*

Syncer.js

@@ -96,7 +96,7 @@ Syncer.prototype.idleVanish = function(accountId, uids)
     var self = this;
     gen.run(function*()
     {
-        let [ boxId ] = yield* self.pg.select('id').from('folders')
+        let [ boxId ] = yield self.pg.select('id').from('folders')
             .where({ name: 'INBOX', account_id: accountId }).val(gen.ef());
         yield* self.deleteVanished(boxId, uids);
     });