(Re)consider conditional yaml dump

[sed-i]

The charm is being (overly?) smart about relation data:

traefik-k8s-operator/src/charm.py

Lines 474 to 475 in 14bc21f

	if config:
	yaml_config = yaml.dump(config) if not isinstance(config, str) else config

The charm lib isn't:

traefik-k8s-operator/lib/charms/traefik_route_k8s/v0/traefik_route.py

Line 204 in 14bc21f

app_databag["config"] = yaml.safe_dump(config)

For consistency, consider:

-        app_databag['config'] = yaml.safe_dump(config)
+        app_databag['config'] = yaml.safe_dump(config) if not isinstance(config, str) else config