x3dPointLightAttenuation difference

[dnvasilev]

Test passes, but golden image differs. We only have S7Edge Golden image; new results are the same on S7Edge and S7Euro. Diff is below.

[mwitchwilliams]

Tested with gvr-x3d-demo. The top <PointLight/> is a constant light, the middle <PointLight/> is a linear attenuation, and the bottom <PointLight/> is a quadratic attenuation.
The rendering is what I would have expected. Perhaps the master vs. test screen shot might be pixel(s) shift horizontally and/or vertically.
Note that GearVRf does not implement the radius value, which cuts off the light after a specified distance. Thus, it is likely there is a little bleeding from each light into each textured plane.