fix(signal-cli): run daemon in multi-account mode without --account flag

- Remove --account flag to let signal-cli auto-detect registered accounts
- Multi-account mode will find the registered +126****8840 account automatically

cluster/applications/signal-cli/deployment.yaml

@@ -28,8 +28,6 @@ spec:
         args:
         - "--config"
         - "/var/lib/signal-cli"
-        - "--account"
-        - "+126****8840"
         - "daemon"
         - "--http"
         - "0.0.0.0:8080"