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/base58.cpp

@@ -51,6 +51,6 @@ static void Base58Decode(benchmark::Bench& bench)
 }
 
 
-BENCHMARK(Base58Encode, benchmark::PriorityLevel::HIGH);
-BENCHMARK(Base58CheckEncode, benchmark::PriorityLevel::HIGH);
-BENCHMARK(Base58Decode, benchmark::PriorityLevel::HIGH);
+BENCHMARK(Base58Encode);
+BENCHMARK(Base58CheckEncode);
+BENCHMARK(Base58Decode);