[stable/external-dns] Fix wrong flag for RFC2136 without TSIG (#12596) (#12598)

Signed-off-by: Christian Mösl <christian.moesl@live.at>

stable/external-dns/Chart.yaml

@@ -3,7 +3,7 @@ description: |
   Configure external DNS servers (AWS Route53, Google CloudDNS and others)
   for Kubernetes Ingresses and Services
 name: external-dns
-version: 1.7.4
+version: 1.7.5
 appVersion: 0.5.13
 home: https://github.com/kubernetes-incubator/external-dns
 sources:

stable/external-dns/templates/deployment.yaml

@@ -104,7 +104,7 @@ spec:
             - --rfc2136-tsig-axfr
               {{- end }}
             {{- else }}
-            - --rfc2136-insecure=false
+            - --rfc2136-insecure
             {{- end }}
           {{- end }}
           volumeMounts: