Fix check if server.ha.replicas is a number when set in values.yaml

[wtfloris]

The commits merged in #943 only work when using --set 'server.ha.replicas=2' from the CLI, not when server.ha.replicas is defined in values.yaml. This behaviour is expected and described in https://github.com/helm/helm/issues/12084. You can see this in action on this playground.

This passes the unit tests because they don't use values.yaml, so only the CLI behaviour is tested and this passed without raising issues.

By checking if the value is either int64 or float64, both cases work. There are no other cases where a value is checked if it's int64, so this should not occur anywhere else in this chart.

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