fix FarPatchTables::GetNumFaces() and FarPatchTables::GetFaceVertices() :
fix FarPatchTables::GetNumFaces() and FarPatchTables::GetFaceVertices() :

These functions are exclusive to uniformly subdivided topology. With the recent refactoring
of PatchTables and the generalization of topology, uniform meshes only retain the topology
of the highest level of subdivision by default. These functions are now fixed to reflect the
change.

takahito-tejima/OpenSubdiv-exp,jcowles/OpenSubdiv,nyotis/OpenSubdiv,nyotis/OpenSubdiv,xldeveloper/OpenSubdiv,anshuarya/OpenSubdiv,shengfuintel/OpenSubdiv,c64kernal/OpenSubdiv,xldeveloper/OpenSubdiv,anshuarya/OpenSubdiv,c64kernal/OpenSubdiv,jcowles/OpenSubdiv,shengfuintel/OpenSubdiv,poljere/OpenSubdiv,takahito-tejima/OpenSubdiv,lookup1980/OpenSubdiv,poljere/OpenSubdiv,xldeveloper/OpenSubdiv,c64kernal/OpenSubdiv,poljere/OpenSubdiv,takahito-tejima/OpenSubdiv-exp,takahito-tejima/OpenSubdiv,takahito-tejima/OpenSubdiv-exp,nyotis/OpenSubdiv,jcowles/OpenSubdiv,lookup1980/OpenSubdiv,anshuarya/OpenSubdiv,lookup1980/OpenSubdiv,shengfuintel/OpenSubdiv,takahito-tejima/OpenSubdiv-exp,takahito-tejima/OpenSubdiv