Fix T47832 - node switching did not update viewport render

Referenced by issue #47832, Cycles: switching "Mix Shader" to "Add Shader" do not update in viewport render. (Node wrangler add-on)

node_wrangler.py

@@ -1897,6 +1897,7 @@ class NWSwitchNodeType(Operator, NWBase):
                     if new_node.outputs:
                         links.new(new_node.outputs[0], out_src_link.to_socket)
             nodes.remove(node)
+        force_update(context)
         return {'FINISHED'}