fix: typo

Author: devthejo

plugins/contrib/charts/app/templates/ingress.yaml

@@ -7,7 +7,7 @@ metadata:
     nginx.ingress.kubernetes.io/rewrite-target: {{ .Values.ingress.rewriteTarget | quote }}
     {{ end }}
     {{ if .Values.customHeaders }}
-    nginx.ingress.kubernetes.io/proxy-set-headers: "{{ .Values.global.namespace }}/ingress-custom-headers"
+    nginx.ingress.kubernetes.io/custom-headers: "{{ .Values.global.namespace }}/ingress-custom-headers"
     {{ end }}
     {{ range $key, $val := (merge dict .Values.global.ingress.annotations .Values.ingress.annotations) }}
     "{{ $key }}": {{ $val | quote }}