Fix(dui3): CNX-291 do not even try to delete "Layer0" (#366)

* Do not try to delete Untagged even if it is changed

* Fix removing active layer with correct condition

speckle_connector_3/src/speckle_objects/relations/layer.rb

@@ -81,7 +81,7 @@ def self.deep_clean(sketchup_model, project_id, model_id)
             if l == sketchup_model.active_layer
               sketchup_model.active_layer = sketchup_model.layers.find { |ly| ly.name == "Layer0" }
             end
-            sketchup_model.layers.remove_layer(l)
+            sketchup_model.layers.remove_layer(l) unless l.name == "Layer0"
           end
         end