[NRRPLT-6225] Corrected the muscle visualization code. It tried to change

the length property of the CylinderGeometry class. According to the THREE js
docs, this does however not have an effect. Therefore, now the object scale
property is updated to obtain the desired length and radius.
The logic now also handles varying number of path points correctly.

Change-Id: I17cc5c09e5fd128acca96bd9f9506317504cd332