xF2 Add-on [AddonsLab] Unread Post Count 1.6.0

This is a bug-fix version, that prevents a PHP error when uninstalling if the product "[AddonsLab] Navigation Badge" is not available (e.g. it was uninstalled first).

This version fixes the bug with counting private forums in the number of unread posts.

The count will be fixed for each user after the cache timeout.

This is a bug-fix version solving the issue with cache timeout not working properly (in the description it said the units to be minutes, but the code was actually considering hours as option's unit).