fix(PolyData): Correctly camelize polydata getNumberOf* methods
fix(PolyData): Correctly camelize polydata getNumberOf* methods

Previously, the properties weren't being properly capitalized, so we
were left with methods such as "getNumberOfverts" and
"getNumberOfpolys". This correctly capitalizes to "getNumberOfVerts",
getNumberOfPolys", etc.

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