DetermineTomvizVersion: check the right variable
DetermineTomvizVersion: check the right variable

mathstuf/tomviz-superbuild,mathturtle/tomviz-superbuild,mathstuf/tomviz-superbuild,OpenChemistry/tomviz-superbuild,OpenChemistry/tomviz-superbuild,cjh1/tomviz-superbuild,mathturtle/tomviz-superbuild,cjh1/tomviz-superbuild