Update NBI ingress since NBI does not use HTTPS

Change-Id: I7883f92ccd330ec870c65014f82601a3d7862db5
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

installers/helm/osm/templates/nbi/nbi-ingress.yaml

@@ -23,7 +23,6 @@ metadata:
     {{- include "osm.labels" . | nindent 4 }}
   annotations:
     nginx.ingress.kubernetes.io/force-ssl-redirect: "true"
-    nginx.ingress.kubernetes.io/backend-protocol: "HTTPS"
 spec:
   ingressClassName: nginx
   rules:
@@ -49,4 +48,4 @@ spec:
       - "nbi.{{ .Values.global.hostname }}"
     {{- end }}
       secretName: nbi-cert
-{{- end }}
\ No newline at end of file
+{{- end }}