Set texture.generateMipmaps according to specified minFilter

[vincentfretin]

Description:

Set texture.generateMipmaps according to specified minFilter.
Since mrdoob/three.js#29677 that's included since three r170 you need to set texture.generateMipmaps to false explicitly if using minFilter 'linear' or 'nearest' to not generate mipmaps.

Changes proposed:

• add texture.generateMipmaps = minFilter !== THREE.NearestFilter && minFilter !== THREE.LinearFilter;

[mrxz]

Change looks good to me. Especially now that we explicitly expose mag/minFilter as properties, it's nice to avoid generating mipmaps when we know they aren't needed.

[dmarcos]

Thank you