Fix the sprites batching example's GLSL
Fix the sprites batching example's GLSL

glium/glium,nicokoch/glium,acolley/glium,christopheraugustus/glium,binsoftware/glium,cpjreynolds/glium,TyOverby/glium,tomaka/glium,bvssvni/glium,carbidegames/glium,sdotz/glium,caldwell/glium