GL3+: Fix PF_L8/PF_L16 formats using correct GL_TEXTURE_SWIZZLE_* (Now the DynTex demo is working correctly)
GL3+: Fix PF_L8/PF_L16 formats using correct GL_TEXTURE_SWIZZLE_* (Now the DynTex
demo is working correctly)

vbudovski/ogre,vbudovski/ogre,vbudovski/ogre,vbudovski/ogre,vbudovski/ogre