GameSettings: clean up texture filtering settings

`MaxAnisotropy = 0` is no longer the safest setting because it forces 1x
even if the game asks for more.

`ForceFiltering` was replaced by `ForceTextureFiltering` in
afe9d5b098ffa32ab92a9795fac9553b29fc4bce. The one remaining occurrence
was merged later.

`ForceTextureFiltering` is an int option and shouldn't be set to False.

Just Dance 3, Just Dance: Best of, and Just Dance: Greatest Hits look
fine on AMD GPUs without manual texture sampling. On Nvidia GPUs they
have a single stripe that I think doesn't warrant forcing manual texture
sampling for everyone.

The NES games I tried worked fine with anisotropic filtering, it just
doesn't do anything.

Various games don't actually have any issue with anisotropic filtering
as long as it's not forced. The only game I could find that actually
requires the default aniso setting is Spider-Man: Shattered Dimensions.

Boogie SuperStar works fine with any texture filtering setting.

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