scripted-diff: Use BlockManager::LookupBlockIndex

[META] In a previous commit, we moved ::LookupBlockIndex to become a
       member function of BlockManager. This commit is split out from
       that one since it can be expressed nicely as a scripted-diff.

-BEGIN VERIFY SCRIPT-
find_regex='LookupBlockIndex' \
    && git grep -l -E "$find_regex" -- src \
        | grep -v '^src/validation\.\(cpp\|h\)$' \
        | xargs sed -i -E "s@${find_regex}@g_chainman.m_blockman.LookupBlockIndex@g"
-END VERIFY SCRIPT-

src/miner.cpp

@@ -45,7 +45,7 @@ void RegenerateCommitments(CBlock& block)
     tx.vout.erase(tx.vout.begin() + GetWitnessCommitmentIndex(block));
     block.vtx.at(0) = MakeTransactionRef(tx);
 
-    GenerateCoinbaseCommitment(block, WITH_LOCK(cs_main, return LookupBlockIndex(block.hashPrevBlock)), Params().GetConsensus());
+    GenerateCoinbaseCommitment(block, WITH_LOCK(cs_main, return g_chainman.m_blockman.LookupBlockIndex(block.hashPrevBlock)), Params().GetConsensus());
 
     block.hashMerkleRoot = BlockMerkleRoot(block);
 }