views: use a single view again for root factory and resources

The data structure is the same again

src/sambal/views/domain.py

@@ -3,13 +3,8 @@
 from sambal.resources import Resource, RootFactory
 
 
-@view_config(context=RootFactory, permission="read", renderer="json")
-def root_view(context, request):
-    """View for the root node (RootFactory)."""
-    return {field: resource for field, resource in context.items()}
-
-
 @view_config(context=Resource, permission="read", renderer="json")
+@view_config(context=RootFactory, permission="read", renderer="json")
 def resource_view(context, request):
     """Temporary view to produce JSON for every node.