Fix wrong spec of sops integration

I specified the sops integration in the wrong K8s object, no wonder it
didn't work 

clusters/okd4/flux-system/gotk-sync.yaml

@@ -15,10 +15,6 @@ spec:
     mode: head
     secretRef:
       name: pgp-public-keys
-  decryption:
-    provider: sops
-    secretRef:
-      name: sops-pgp
 ---
 apiVersion: kustomize.toolkit.fluxcd.io/v1beta1
 kind: Kustomization
@@ -33,3 +29,7 @@ spec:
     kind: GitRepository
     name: flux-system
   validation: client
+  decryption:
+    provider: sops
+    secretRef:
+      name: sops-pgp