Never use scientific notation for TPC-C efficiency (#17333) (#21742)

Author: eivanov89

ydb/library/workload/tpcc/runner.cpp

@@ -651,7 +651,7 @@ void TPCCRunner::PrintFinalResultPretty() {
     if (minutesPassed >= 1) {
         std::cout << "warehouses: " << Config.WarehouseCount << std::endl;
         std::cout << "tpmC: " << DataToDisplay->StatusData.Tpmc << "*" << std::endl;
-        std::cout << "efficiency: " << std::setprecision(2) << DataToDisplay->StatusData.Efficiency << "%" << std::endl;
+        std::cout << "efficiency: " << std::fixed << std::setprecision(2) << DataToDisplay->StatusData.Efficiency << "%" << std::endl;
         std::cout << "* These results are not officially recognized TPC results "
                   << "and are not comparable with other TPC-C test results published on the TPC website" << std::endl;
     } else {