GodotCylinderShape3D::get_supports: delete dead code

[rburing]

Delete dead code which was presumably left over from testing. I didn't manage to understand the Math::abs(h) <= 1.0 case in the dead code, or find an other physics engine with a cylinder support mapping that looks like that. For example, in the p_normal direction indicated by the raycast in the picture below, the dead code would return the red point as the support point:

But the red point is not a true support point, since e.g. all the points directly above it on the cylinder surface are "more extreme" points in the p_normal direction (they have a higher dot product with p_normal).

For posterity I observe that GodotCylinderShape3D::get_support (which replaces the dead code) is almost the support function from page 8 of A Fast and Robust GJK Implementation for Collision Detection of Convex Objects by Gino van den Bergen, except for (the use of !Math::is_zero_approx(s) instead of s > 0.0, and) the different $x$-coordinate in the "otherwise" case.

[akien-mga]

Thanks!