exporting VTJjs

Hello, exporting to VTKjs, either with `plotter.export_vtksz` or `plotter.export_html` (which I guess works more or less in the same way) returns the error:

`ImportError: Please install trame dependencies: pip install "pyvista[jupyter]"`

However my Qt canvas, embedded in a Qt application, is not a Jupyter canvas, so this is a bit surprising.

Thanks!