iOS: Fix a bug I just introduced that could cause the color buffer to not be rebound on iOS 3
iOS: Fix a bug I just introduced that could cause the color buffer to not be rebound on iOS 3

--HG--
branch : v1-7

ehsan/ogre,bhlzlx/ogre,ehsan/ogre,bhlzlx/ogre,ehsan/ogre,ruleless/ogre,bhlzlx/ogre,ruleless/ogre,bhlzlx/ogre,ruleless/ogre,ehsan/ogre,ruleless/ogre,ehsan/ogre,bhlzlx/ogre,bhlzlx/ogre,ruleless/ogre,ruleless/ogre