Fix ListCoins test failure due to unset g_wallet_allow_fallback_fee #12582
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New global variable was introduced in #11882 and not setting it causes:
It's possible to reproduce the failure reliably by running:
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.
This is similar to bugs #12150 and #12424. Example travis failures are:
https://travis-ci.org/bitcoin/bitcoin/jobs/348296805#L2676
https://travis-ci.org/bitcoin/bitcoin/jobs/348362560#L2769
https://travis-ci.org/bitcoin/bitcoin/jobs/348362563#L2824