Anisotropic filtering isn't enabled on the web build

[Calinou]

• Related to Antialiasing options are not effective on web build #369.

On https://play.neverball.org as of July 2024, anisotropic filtering isn't enabled, which leads to blurry textures when viewed at an angle.

I'm not sure if gl4es has a way to enable anisotropic filtering, but it's definitely possible to enable it in WebGL 1.0 in general (WebGL 2.0 isn't required for this).