Fixes textAlignment issue with attributed strings.
Fixes textAlignment issue with attributed strings.

Reverts code back to previous code with penOffset. Not 100% sure if this has any side effects. #474
yanyuqingshi/TTTAttributedLabel,jianwoo/TTTAttributedLabel,yimouleng/TTTAttributedLabel,NewAmsterdamLabs/TTTAttributedLabel,hao-hua/TTTAttributedLabel,KILLI/TTTAttributedLabel,zhwcoder/TTTAttributedLabel,zilanfeng/TTTAttributedLabel,WWLJ/TTTAttributedLabel,TTTAttributedLabel/TTTAttributedLabel,buiminhhuy/TTTAttributedLabel,rtsbtx/TTTAttributedLabel,BarakRL/TTTAttributedLabel,engmahsa/TTTAttributedLabel,CoderIvanLee/TTTAttributedLabel,mjhassan/TTTAttributedLabel,hoaquo/TTTAttributedLabel,yaoxiaoyong/TTTAttributedLabel,denivip/TTTAttributedLabel,z8927623/TTTAttributedLabel,Akylas/TTTAttributedLabel,JIFFinc/TTTAttributedLabel,Nykho/TTTAttributedLabel,Naithar/TTTAttributedLabel,FiftyThree/TTTAttributedLabel,SampleLiao/TTTAttributedLabel,lookingstars/TTTAttributedLabel,XZwalk/TTTAttributedLabel,mattt/TTTAttributedLabel,sunzeboy/TTTAttributedLabel,zhouwude/TTTAttributedLabel,TimorCan/TTTAttributedLabel,Voxer/TTTAttributedLabel,devandroid/TTTAttributedLabel,FishMemory/TTTAttributedLabel