Fix regression in CCLabelBMFont that was causing an unalignment in the vertical position of the characters.
Fix regression in CCLabelBMFont that was causing an unalignment in the vertical position of the characters.

zmaruo/CocosSharp,haithemaraissia/CocosSharp,netonjm/CocosSharp,MSylvia/CocosSharp,MSylvia/CocosSharp,haithemaraissia/CocosSharp,hig-ag/CocosSharp,TukekeSoft/CocosSharp,zmaruo/CocosSharp,netonjm/CocosSharp,mono/CocosSharp,mono/CocosSharp,hig-ag/CocosSharp,TukekeSoft/CocosSharp