Polishing my clown shoes

When working out the tangents to a capsule-collider, I do a good ol'
acos(radius / playertocapsule.magnitude) to work out some handy angles.
Unfortunately, I forgot to remove the y component from the
playertocapsule vector, which caused the magnitude to be iffy.
Y has now been forced to 0, allowing the people of flatland to rejoice.