[bitcoin/bitcoin] qa: CoinSelection benchmark assert fails (#13831)

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$ ./src/bench/bench_bitcoin -filter=CoinSelection

# Benchmark, evals, iterations, total, min, max, median
bench_bitcoin: bench/coin_selection.cpp:54: void CoinSelection(benchmark::State&): Assertion `success’ failed.
[1] 24547 abort (core dumped) ./src/bench/bench_bitcoin -filter=CoinSelection

$ cat <(git rev-parse HEAD) <(uname -a) <(gcc --version) 4d550ffab64d79a44fcaa76f6e30c28f01614d3f Linux james 4.4.0-119-generic #143+jamesob SMP Mon Apr 16 21:47:24 EDT 2018 x86_64 x86_64 x86_64 GNU/Linux gcc (Ubuntu 5.4.0-6ubuntu1~16.04.10) 5.4.0 20160609 ``` Based on some cursory debugging, [this conditional](https://github.com/bitcoin/bitcoin/blob/4d550ffab64d79a44fcaa76f6e30c28f01614d3f/src/wallet/coinselection.cpp#L78-L80) is causing the BnB routine to return false which then fails [the assert](https://github.com/bitcoin/bitcoin/blob/4d550ffab64d79a44fcaa76f6e30c28f01614d3f/src/bench/coin_selection.cpp#L52-L53).

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