rpc/createwallet: omitted named arguments

The current output for passphrase results in a non-optional passphrase which is incorrect.

Author: kallewoof

src/wallet/rpcwallet.cpp

@@ -2696,7 +2696,7 @@ static RPCHelpMan createwallet()
             {"wallet_name", RPCArg::Type::STR, RPCArg::Optional::NO, "The name for the new wallet. If this is a path, the wallet will be created at the path location."},
             {"disable_private_keys", RPCArg::Type::BOOL, RPCArg::Default{false}, "Disable the possibility of private keys (only watchonlys are possible in this mode)."},
             {"blank", RPCArg::Type::BOOL, RPCArg::Default{false}, "Create a blank wallet. A blank wallet has no keys or HD seed. One can be set using sethdseed."},
-            {"passphrase", RPCArg::Type::STR, RPCArg::Optional::OMITTED, "Encrypt the wallet with this passphrase."},
+            {"passphrase", RPCArg::Type::STR, RPCArg::Optional::OMITTED_NAMED_ARG, "Encrypt the wallet with this passphrase."},
             {"avoid_reuse", RPCArg::Type::BOOL, RPCArg::Default{false}, "Keep track of coin reuse, and treat dirty and clean coins differently with privacy considerations in mind."},
             {"descriptors", RPCArg::Type::BOOL, RPCArg::Default{false}, "Create a native descriptor wallet. The wallet will use descriptors internally to handle address creation"},
             {"load_on_startup", RPCArg::Type::BOOL, RPCArg::Default{UniValue::VNULL}, "Save wallet name to persistent settings and load on startup. True to add wallet to startup list, false to remove, null to leave unchanged."},