message: Simplify vcx agency pgsql configuration sample
diff: "config": {
  "url": "localhost:5432",
  "max_connections" : 90,
  - "min_idle_count" : 5,
  "connection_timeout" : 30,
  "wallet_scheme": "MultiWalletSingleTableSharedPool"
  },
  "admin_account": "postgres",
  "admin_password": "mysecretpassword"
  },
  - "type": "postgres_storage",
  - "plugin_init_function": null,
  - "plugin_library_path": null
  + "type": "postgres_storage"
  },
  "indy_runtime": {
  "crypto_thread_pool_size": 4
  