[UW] Forum Comments System 1.8.18

Change log

🔸When more guest users were posting comments, the "Whats new" page, "Latest posts" widget, and the "New posts" page, were showing incorrect last posting guest user's name.
So this was fixed.

🔸Posted comments by guest users were causing the bold links (indicating a new post) to be bold all the time.
So this was fixed.