Persist 'geomap_wms_spatial_filter_geometry' variable #77
Description
Make the variable "geomap_wms_spatial_filter_geometry" persistent, that is enable the spatial filter tool to retrieve the spatial filter variable and do not overwrite it with the default value.
If the user saves the dashboard with the current variables as default settings then the spatial filter tool should load the initial variable from the dashboard configuration and not unset the variable.