clock: Bug fix: The timer should continue even when the clock is adjusted

If the clock is reversed:
* lastSystemTime should be reset with the current time
* FPS/TPS calculation state should be reset

internal/clock/clock.go

@@ -63,6 +63,7 @@ func calcCountFromTPS(tps int64, now int64) int {
 	diff := now - lastSystemTime
 	if diff < 0 {
 		// It is theoretically possible to change the OS clock, so now can be older than lastSystemTime.
+		lastSystemTime = now
 		return 0
 	}
 
@@ -101,6 +102,13 @@ func updateFPSAndTPS(now int64, count int) {
 	}
 	fpsCount++
 	tpsCount += count
+	if now < lastUpdated {
+		// It is theoretically possible to change the OS clock, so now can be older than lastSystemTime.
+		lastUpdated = now
+		fpsCount = 0
+		tpsCount = 0
+		return
+	}
 	if time.Second > time.Duration(now-lastUpdated) {
 		return
 	}