Add metrics port to the operator deployment.

Even if the `.Values.prometheus.operator.enabled` was set to `true`, the
operator Deployment was not declaring an additional port for exposing
metrics. This behavior differs to the one that e.g. webhooks have.

This PR adds the missing port declaration.

Signed-off-by: Milan Plzik <milan.plzik@grafana.com>

keda/templates/manager/deployment.yaml

@@ -119,6 +119,11 @@ spec:
           - containerPort: 8080
             name: http
             protocol: TCP
+          {{- if .Values.prometheus.operator.enabled }}
+          - containerPort: {{ .Values.prometheus.operator.port }}
+            name: metrics
+            protocol: TCP
+          {{- end }}            
           env:
             - name: WATCH_NAMESPACE
               value: {{ .Values.watchNamespace | quote }}