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

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branch : v1-7

digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre