Align sync mode fps measurement in py benchmark_app with cpp benchmark_app (#17773)

tools/benchmark_tool/openvino/tools/benchmark/benchmark.py

@@ -162,6 +162,7 @@ class Benchmark:
     def main_loop(self, requests, data_queue, batch_size, latency_percentile, pcseq):
         if self.api_type == 'sync':
             times, total_duration_sec, iteration = self.sync_inference(requests[0], data_queue)
+            fps = len(batch_size) * iteration / total_duration_sec
         elif self.inference_only:
             times, total_duration_sec, iteration = self.async_inference_only(requests)
             fps = len(batch_size) * iteration / total_duration_sec
@@ -174,9 +175,6 @@ class Benchmark:
         min_latency_ms = times[0]
         max_latency_ms = times[-1]
 
-        if self.api_type == 'sync':
-            fps = len(batch_size) * 1000 / median_latency_ms
-
         if pcseq:
             for group in self.latency_groups:
                 if group.times: