fix(transmission): point ArgoCD app to bananaspliff/transmission chart

ArgoCD reported: chart 'transmission-openvpn' not found in https://k8s-at-home.com/charts/.\nSwitch to bananaspliff/geek-charts 'transmission' which matches our values pattern (env/volumes/volumeMounts).\n\nCommitted via Codex CLI.

applications/transmission.yaml

@@ -6,8 +6,8 @@ metadata:
 spec:
   project: default
   sources:
-    - repoURL: https://k8s-at-home.com/charts/
+    - repoURL: https://bananaspliff.github.io/geek-charts
-      chart: transmission-openvpn
+      chart: transmission
       targetRevision: "*"
       ref: charts
       helm:
@@ -27,4 +27,3 @@ spec:
     syncOptions:
     - CreateNamespace=true
     - ServerSideApply=true
-