Add manager init container image to values

[catemiko]

Manager init container image should be added in values, instead being hardcoded into templates. https://github.com/morgoved/wazuh-helm/blob/9bc984b17db754692435fe699b21a5a156e0378c/charts/wazuh/templates/manager/master/statefulset.yaml#L80-L83

https://github.com/morgoved/wazuh-helm/blob/9bc984b17db754692435fe699b21a5a156e0378c/charts/wazuh/templates/manager/worker/statefulset.yaml#L95-L98

[morgoved]

@catemiko If you need to be able to change this, you can always make a PR