[rich! @ etiviti]

well the easiest way is to just extract the snippet and replace a line of code

open up
bp-forum-extras-index.php

place this class BP_Forum_Extras_Index_Latest_Topics_Widget extends WP_Widget into the bp-custom.php file

then replace the line
if ( bp_forum_extras_blogs_component() )
with
if ( $bp->forums->slug == $bp->current_component )