staging/graphql/ingress: Fix double if instruction

Somehow, I missed that the and was used as a prefix notation.

Related to T4135

---

Migrated from D8363 (view on Phabricator)

swh/templates/graphql/ingress.yaml

-{{ if .Values.graphql.enabled -}}
-{{ if .Values.graphql.ingress.enabled -}}
+{{ if and .Values.graphql.enabled .Values.graphql.ingress.enabled -}}
 apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata:
@@ -26,4 +25,3 @@ spec:
     {{- end }}
 
 {{ end }}
-{{ end }}