Fix for wrong start time

The performance testing extension outputs the Date field in seconds, rather than milliseconds.

Author: cabauman

UnityPerformanceBenchmarkReporter/PerformanceTestRunProcessor.cs

@@ -188,7 +188,7 @@ public PerformanceTestRunResult CreateTestRunResult(PerformanceTestRun runResult
                 IsBaseline = isBaseline,
                 TestSuite = runResults.TestSuite,
                 StartTime =
-                    new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).AddMilliseconds(
+                    new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).AddSeconds(
                         runResults.StartTime),
                 TestResults = testResults,
                 PlayerSystemInfo = runResults.PlayerSystemInfo,