Simplify passing public key argument multiple times to craete_account_with_keys method

Fixes mypy errors:
- package/test_tools/__private/wallet.py:1234: error: "create_account_with_keys" of "__Api" gets multiple values for keyword argument "broadcast"
- package/test_tools/__private/wallet.py:1235: error: Argument 4 to "create_account_with_keys" of "__Api" has incompatible type "*List[PublicKey]"; expected "bool"