filename variable is not forwarded in unstructured/python/m3dc1/plot_field.py

[wingena]

In line 198, replace
meshplt = plot_mesh(mesh_ob,boundary=bound,ax=axs,meshcol='C1',pub=pub,phys=phys,quiet=quiet)

with
meshplt = plot_mesh(mesh_ob,filename=filename,boundary=bound,ax=axs,meshcol='C1',pub=pub,phys=phys,quiet=quiet)