Revert "PointSprite enable() should not toggle Texture2D enable()"
Revert "PointSprite enable() should not toggle Texture2D enable()"

This reverts commit bb6ffc98aa0e72ada57d9040ecc4fb2ee4d23fbd as it was a
source of confusion that just calling enable() would not enable Point Sprites
if GL_TEXTURE_2D was previously disabled.

sschuberth/parandroid