scripted-diff: Remove priority_level from BENCHMARK macro

-BEGIN VERIFY SCRIPT-

 sed --in-place --regexp-extended 's/BENCHMARK\(([^,]+), benchmark::PriorityLevel::(HIGH|LOW)\)/BENCHMARK(\1)/g' $( git grep -l PriorityLevel )
 sed --in-place                   's/#define BENCHMARK(n, priority_level)/#define BENCHMARK(n)/g'                ./src/bench/bench.h

-END VERIFY SCRIPT-

src/bench/sign_transaction.cpp

@@ -100,7 +100,7 @@ static void SignSchnorrWithNullMerkleRoot(benchmark::Bench& bench)
     SignSchnorrTapTweakBenchmark(bench, /*use_null_merkle_root=*/true);
 }
 
-BENCHMARK(SignTransactionECDSA, benchmark::PriorityLevel::HIGH);
-BENCHMARK(SignTransactionSchnorr, benchmark::PriorityLevel::HIGH);
-BENCHMARK(SignSchnorrWithMerkleRoot, benchmark::PriorityLevel::HIGH);
-BENCHMARK(SignSchnorrWithNullMerkleRoot, benchmark::PriorityLevel::HIGH);
+BENCHMARK(SignTransactionECDSA);
+BENCHMARK(SignTransactionSchnorr);
+BENCHMARK(SignSchnorrWithMerkleRoot);
+BENCHMARK(SignSchnorrWithNullMerkleRoot);