Fix ListCoins test failure due to unset g_address_type, g_change_type
Fix ListCoins test failure due to unset g_address_type, g_change_type

New global variables were introduced in #11403 and not setting them causes:

    test_bitcoin: wallet/wallet.cpp:4199: CTxDestination GetDestinationForKey(const CPubKey&, OutputType): Assertion `false' failed.
    unknown location(0): fatal error in "ListCoins": signal: SIGABRT (application abort requested)

It's possible to reproduce the failure reliably by running:

    src/test/test_bitcoin --log_level=test_suite --run_test=wallet_tests/ListCoins

Failures happen nondeterministically because boost test framework doesn't run
tests in a specified order, and tests that run previously can set the global
variables and mask the bug.

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