Cannot remove extra quads in the cylindrical part of CapsuleMesh and CylinderMesh

[Zylann]

Godot 3.0.4

There are extra Quads in the cylindrical section of CapsuleMesh and CylinderMesh.

If you remove rings in CapsuleMesh, it also reduces them on the spherical sections, which is unwanted.
You cannot remove all rings from CylinderMesh, there is always at least one in the middle.

[Calinou]

You cannot remove all rings from CylinderMesh, there is always at least one in the middle.

This was fixed for CylinderMesh by #49731.

As for CapsuleMesh, the comments on #49730 make me think that allowing this change (and adding another property for it) would be undesired. It's not always faster to render less triangles, if having long thin triangles is the only alternative.