Resolve WB-479: Label outlines are sometimes wrong. When coloring CIFTI label...

Resolve WB-479: Label outlines are sometimes wrong.  When coloring CIFTI label files, topology information is needed and the label coloring logic was using the topology from first surface in the corresponding brain structure assuming the all files used for a structure used the same topology.  However, that is not true.  In this instance, a flat surface topology was used for when coloring a closed surface.  As a result, labels where the flat surface was cut did not have the correct node neighbor information causing the incorrect coloring.  Now, the surface topology is obtained from the surface that is being colored and fixes this problem.