fix: correct ingress-antispam rewrite rule

mailu/Chart.yaml

@@ -2,5 +2,5 @@ apiVersion: v2
 name: mailu
 description: Helm Chart for Mailu
 type: application
-version: 1.3.6
+version: 1.3.7
 appVersion: "1.9.26"

mailu/templates/ingress-antispam.yaml

@@ -8,6 +8,7 @@ metadata:
   annotations:
     nginx.ingress.kubernetes.io/auth-url:
       "http://{{ include "mailu-helm.fullname" . }}-admin.{{ .Release.Namespace }}.svc.{{ .Values.clusterSuffix }}/internal/auth/admin"
+    nginx.ingress.kubernetes.io/rewrite-target: "/$2"
     nginx.ingress.kubernetes.io/configuration-snippet: |
       proxy_set_header X-Real-IP "";
       proxy_set_header X-Forwarded-For "";