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/poly1305.cpp

@@ -41,6 +41,6 @@ static void POLY1305_1MB(benchmark::Bench& bench)
     POLY1305(bench, BUFFER_SIZE_LARGE);
 }
 
-BENCHMARK(POLY1305_64BYTES, benchmark::PriorityLevel::HIGH);
-BENCHMARK(POLY1305_256BYTES, benchmark::PriorityLevel::HIGH);
-BENCHMARK(POLY1305_1MB, benchmark::PriorityLevel::HIGH);
+BENCHMARK(POLY1305_64BYTES);
+BENCHMARK(POLY1305_256BYTES);
+BENCHMARK(POLY1305_1MB);