Update next/prev links to respect disable title and escape options

It wasn't possible to disable escaping of HTML link text for disabled next/prev links, while it worked fine for others (active next/prev links and first/last links). Fixes issue shown in screenshot:

![image](https://cloud.githubusercontent.com/assets/24155/4931458/e5b25cb0-6578-11e4-977f-9ee5ace4f542.png)