Flux lines plot in Maxwell

[anur7]

Description of the feature

Using create_fieldplot_surface() method to plot a field, the plot's attribute "IsoValType" is "Fringe" by default:

In Maxwell, for Flux lines plot "IsoValType" is "Line":

Steps for implementing the feature

In "plotsettings" in field_data.py if the field quantity is "Flux_Lines", the "IsoValType" is "Line".

Useful links and references

No response