Fixed namespace usage

src/workers/Benchmark.cpp

@@ -34,7 +34,7 @@ void Benchmark::start_perf_bench(const xmrig::PerfAlgo pa) {
     Workers::switch_algo(xmrig::Algorithm(pa)); // switch workers to new algo (Algo part)
 
     // prepare test job for benchmark runs
-    Job job;
+    xmrig::Job job;
     job.setPoolId(-100); // to make sure we can detect benchmark jobs
     job.setId(xmrig::Algorithm::perfAlgoName(pa)); // need to set different id so that workers will see job change
     const static uint8_t test_input[76] = {