terraform: the import RootTransformer should run last

This was causing multiple root issues

terraform/graph_builder_import.go

@@ -49,12 +49,12 @@ func (b *ImportGraphBuilder) Steps() []GraphTransformer {
 		&DisableProviderTransformerOld{},
 		&PruneProviderTransformer{},
 
-		// Single root
-		&RootTransformer{},
-
 		// Insert nodes to close opened plugin connections
 		&CloseProviderTransformer{},
 
+		// Single root
+		&RootTransformer{},
+
 		// Optimize
 		&TransitiveReductionTransformer{},
 	}