Fix a typo when checking the support for ingress classname in orion

[john-jam]

When installing the orion chart with ingress.className defined, the following error occurs:

Error: template: prefect-orion/templates/ingress.yaml:23:51: executing "prefect-orion/templates/ingress.yaml" at <include "common.ingress.supportsIngressClassName" .>: error calling include: template: no template "common.ingress.supportsIngressClassName" associated with template "gotpl"

I think there's a typo in the helper call since it's a lower n in the bitnami/common documentation: https://artifacthub.io/packages/helm/bitnami/common/2.0.2#ingress

[jamiezieziula]

good catch!