values.yaml: fix `ingress` default value
When ingress is empty, we use Helm's default filter in
_helpers.tpl to provide a default value. If the field contains a
value, even an empty string, then the filter doesn't get applied
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When ingress is empty, we use Helm's default filter in
_helpers.tpl to provide a default value. If the field contains a
value, even an empty string, then the filter doesn't get applied