Fix typo, corrected control flow logic flaw

Verify that `--profile` option results in setting `m_run_once`:

```
(nvbench) opavlyk@ee09c48-lcedt:~/repos/nvbench$ ./build/bin/nvbench.example.cpp20.axes -b simple -d 0 --profile | grep "Pass: Cold"
Pass: Cold: 1.006560ms GPU, 1.009277ms CPU, 0.00s total GPU, 0.00s total wall, 1x

(nvbench) opavlyk@ee09c48-lcedt:~/repos/nvbench$ ./build/bin/nvbench.example.cpp20.axes -b simple -d 0 | grep "Pass: Cold"
Pass: Cold: 1.002844ms GPU, 1.011917ms CPU, 0.50s total GPU, 0.52s total wall, 499x
```

Author: oleksandr-pavlyk

nvbench/option_parser.cu

@@ -751,7 +751,8 @@ catch (std::exception &e)
 
 void option_parser::enable_profile()
 {
-  // If no active benchmakr, save args as global
+  // If no active benchmark, save args as global
+  if (m_benchmarks.empty())
   {
     m_global_benchmark_args.push_back("--profile");
     return;