Fixes a regression in The Evil Within.
We should probably find a proper solution, but for now this is the best
thing we can do for games which reuse command lists.
When setting d3d11.samplerAnisotropy to a non-negative value,
AF will be either disabled (0) or enabled with the given
anisotropy (>0) for all samplers.
Apparently this breaks Elder Scrolls Online as well, so we'll
just enable it explicitly for games which benefit from this
optimization and disable it by default.