Fix ingressclass semver comparison in helm chart

Bug first appeared in: d893dd0

Helm will fail to install the ingressclass resource when the patch value
of the semver contains some non-numerical suffix.

For example:
* v1.18.8-rc.1
* v1.18.10-gke.601

deployments/helm-chart/templates/controller-ingress-class..yaml

@@ -1,4 +1,4 @@
-{{- if semverCompare ">=1.18.0" .Capabilities.KubeVersion.GitVersion }}
+{{- if semverCompare ">=1.18.0-0" .Capabilities.KubeVersion.GitVersion }}
 apiVersion: networking.k8s.io/v1beta1
 kind: IngressClass
 metadata: