fix(STLReader): Use a different binary STL heuristic
fix(STLReader): Use a different binary STL heuristic

SolidWorks outputs binary STLs with "solid" in the header, which
triggers a false positive on detecting binary vs ascii STL files.

Kitware/vtk-js,Kitware/vtk-js,Kitware/vtk-js,Kitware/vtk-js