Fixed byte order for Texture2D.GetData to ARGB on Android

see http://developer.android.com/reference/android/graphics/Bitmap.html and http://developer.android.com/reference/android/graphics/Color.html

the latter states that the order should be ARGB:
(alpha << 24) | (red << 16) | (green << 8) | blue

Detected the wrong order when developing a screenshot (& mail) module for a current game project... 


NB: sorry for the (unnecessary) additional change on line 597, my VS converted the tabs to spaces...