Merge bitcoin/bitcoin#26243: test: Remove unused fCheckpointsEnabled from miner_tests

fa9436e test: Remove unused fCheckpointsEnabled from miner_tests (MacroFake)

Pull request description:

  The earliest checkpoint is at height 11111, so this can't possibly have any impact on this test.

ACKs for top commit:
  fanquake:
    ACK fa9436e - given the low number of blocks, having the additional check in `ContextualCheckBlockHeader()` enabled should be a no-op, so disabling and re-enabling is dead code.

Tree-SHA512: 7d1b952c297c915e9588761f82f5006cf5186b7ff30e8a1c702302e0b44afe536bde9eda8acf2995825ae01d2ad9d2393ae2feefb29f15676aaf71881941579b

Author: fanquake

src/test/miner_tests.cpp

@@ -558,8 +558,6 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     CScript scriptPubKey = CScript() << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f") << OP_CHECKSIG;
     std::unique_ptr<CBlockTemplate> pblocktemplate;
 
-    fCheckpointsEnabled = false;
-
     // Simple block creation, nothing special yet:
     BOOST_CHECK(pblocktemplate = AssemblerForTest(chainparams).CreateNewBlock(scriptPubKey));
 
@@ -608,8 +606,6 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     m_node.mempool->clear();
 
     TestPrioritisedMining(chainparams, scriptPubKey, txFirst);
-
-    fCheckpointsEnabled = true;
 }
 
 BOOST_AUTO_TEST_SUITE_END()