Fix tox whitespace warning

Author: Alex-Welsh

etc/kayobe/kolla.yml

@@ -369,7 +369,7 @@ kolla_build_customizations: "{{ kolla_build_customizations_common | combine(koll
 
 # Dict mapping Kolla Dockerfile ARG names to their values.
 kolla_build_args:
-  node_exporter_version: "1.5.0" # kolla has 1.4.0
+  node_exporter_version: "1.5.0"  # kolla has 1.4.0
   node_exporter_sha256sum: "af999fd31ab54ed3a34b9f0b10c28e9acee9ef5ac5a5d5edfdde85437db7acbb"
 
 ###############################################################################