Fix detection in VBulletin.on_posts_modified()
Fix detection in VBulletin.on_posts_modified()

andrew-sayers--frontier-forums/frontier-forums-moderation-tools,andrew-sayers--frontier-forums/frontier-forums-moderation-tools,andrew-sayers--frontier-forums/frontier-forums-moderation-tools,andrew-sayers--frontier-forums/frontier-forums-moderation-tools