apps/ninja: rename kustomization variables

so the dashboard can read them

apps/ninja/invoiceninja-kustomization.yaml

@@ -26,7 +26,7 @@ spec:
       - kind: Secret
         name: stackspin-invoiceninja-variables
       - kind: ConfigMap
-        name: stackspout-invoiceninja-kustomization-variables
+        name: stackspin-invoiceninja-kustomization-variables
       - kind: Secret
         name: stackspin-invoiceninja-oauth-variables
         optional: true

apps/ninja/invoiceninja-secrets/invoiceninja-kustomization-variables.yaml

 apiVersion: v1
 kind: ConfigMap
 metadata:
-  name: stackspout-invoiceninja-kustomization-variables
+  name: stackspin-invoiceninja-kustomization-variables
   namespace: flux-system
 data:
   invoiceninja_domain: ninja.${domain}