[Bitcoin-ABC/bitcoin-abc] add test for transaction sort in block (#245)

maybe a bug for transaction sort in block; when mining, the transactions in block Sorted in descending order;but when a New block connect, check transactions in block with ascending order .
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— Commit Summary —

* add test for transaction sort in block

— File Changes —

M src/test/miner_tests.cpp (48)

— Patch Links —