[OGRE-61] Terrain sample, setShadowTextureCasterMaterial is misleading. Don't explicitly set the shadow caster material as it is set in the buildDepthShadowMaterial function.
[OGRE-61] Terrain sample, setShadowTextureCasterMaterial is misleading. Don't explicitly set the shadow caster material as it is set in the buildDepthShadowMaterial function.

--HG--
branch : v1-9

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