Fixed topic post number being incorrect if we're not on page 1.
Fixed topic post number being incorrect if we're not on page 1.

dromanow/flaskbb,realityone/flaskbb,SeanChen0617/flaskbb,qitianchan/flaskbb,emile2016/flaskbb,SeanChen0617/flaskbb,lucius-feng/flaskbb,SeanChen0617/flaskbb-1,Aaron1992/flaskbb,SeanChen0617/flaskbb,emile2016/flaskbb,SeanChen0617/flaskbb-1,zky001/flaskbb,China-jp/flaskbb,realityone/flaskbb,China-jp/flaskbb,realityone/flaskbb,zky001/flaskbb,lucius-feng/flaskbb,dromanow/flaskbb,Aaron1992/flaskbb,qitianchan/flaskbb,lucius-feng/flaskbb,China-jp/flaskbb,dromanow/flaskbb,qitianchan/flaskbb,zky001/flaskbb,SeanChen0617/flaskbb-1,emile2016/flaskbb,Aaron1992/flaskbb