This reverts commit 7edb2f42.

This fix is incorrect since it ends up importing the _vtkmodules_static
shared library even when the module is being imported in a static
`vtkpython` executable, which already has setup the static import
callbacks. _vtkmodules_static is only need when the `import vtk` is
called from a standard Python interpreter and not `vtkpython` the `if
...` guard tested that case.