Fix the sign of the Accelerometer for iOS.
Fix the sign of the Accelerometer for iOS.

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