Minor cleanup to test/_opengl/usampler2D
Minor cleanup to test/_opengl/usampler2D

sosolimited/Cinder,sosolimited/Cinder,2666hz/Cinder,morbozoo/sonyHeadphones,morbozoo/sonyHeadphones,sosolimited/Cinder,sosolimited/Cinder,2666hz/Cinder,morbozoo/sonyHeadphones,morbozoo/sonyHeadphones,2666hz/Cinder,2666hz/Cinder