Use a correct default value for half space initialization in from_clip_from_world_no_far

[atlv24]

Objective

• Fixes a bug where Frustums constructed by from_clip_from_world_no_far will consider all Aabbs and all zero-radius spheres to not be in the frustum if far plane culling is enabled

Solution

• initialize to a correct default

Testing

• bug has not been observed in the wild, only discovered by audit. example. from intersects_obb, in the halfspace loop:

let relative_radius = aabb.relative_radius(&p_normal, &world_from_local.matrix3);
if half_space.normal_d().dot(aabb_center_world) + relative_radius <= 0.0 {
    return false;
}

relative radius is a bunch of dot products with the frustum plane (which is 0) so it is 0.
normal dot aabb center again is 0, 0 + 0 is 0, which is <= 0. The if gets hit, and intersects returns false, wrongly.

Changing d to f32::MAX instead makes the normal_d dot center extended by 1 result in f32::MAX, which is not <= 0, and thus intersect can succeed

[atlv24]

Something to note I didnt tackle here is that HalfSpace is a pub type and impl's Default. I would say the current Default doesnt make sense, but there's actually no .contains method on it, its just a thin wrapper over Vec4. We may want to pull this out into bevy_math and make it more broadly useful (with an appropriate Default impl) at some point. This is just a minimal bugfix.