fix calls to next_diff() in tests to use next height correctly #3501
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Related #3477
We had some test failures related to bad (legacy) test setup code.
We need to use the correct next height when determining the next difficulty, when building blocks in the tests.
Also had some tests just using
Difficulty::min_dma()
but this does not work beyond HF4.So reworked those tests to use
next_header_info.difficulty
.