Fix inaccuracy of sleep time calculation

[Masy]

The faster a tick executes the fewer tps (don't know why yet)

Timings when the tick method is empty:

Fluctuation: 10.0/10 TPS
Average time in last second: 100.1/100.0ms
Fluctuation: 20.0/20 TPS
Average time in last second: 50.1/50.0ms
Fluctuation: 30.0/30 TPS
Average time in last second: 33.433334/33.333332ms
Fluctuation: 40.0/40 TPS
Average time in last second: 25.1/25.0ms
Fluctuation: 49.79999923706055/50 TPS
Average time in last second: 20.08/20.0ms
Fluctuation: 59.79999923706055/60 TPS
Average time in last second: 16.75/16.666666ms
Fluctuation: 69.5999984741211/70 TPS
Average time in last second: 14.3714285/14.285714ms
Fluctuation: 79.5999984741211/80 TPS
Average time in last second: 12.6/12.5ms
Fluctuation: 89.4000015258789/90 TPS
Average time in last second: 11.211111/11.111111ms
Fluctuation: 99.19999694824219/100 TPS
Average time in last second: 10.11/10.0ms
Fluctuation: 109.0/110 TPS
Average time in last second: 9.181818/9.090909ms
Fluctuation: 118.80000305175781/120 TPS
Average time in last second: 8.433333/8.333333ms
Fluctuation: 128.39999389648438/130 TPS
Average time in last second: 7.792308/7.6923075ms
Fluctuation: 138.39999389648438/140 TPS
Average time in last second: 7.242857/7.142857ms
Fluctuation: 148.1999969482422/150 TPS
Average time in last second: 6.766667/6.6666665ms
Fluctuation: 158.0/160 TPS
Average time in last second: 6.35625/6.25ms
Fluctuation: 167.39999389648438/170 TPS
Average time in last second: 5.9764705/5.882353ms
Fluctuation: 177.1999969482422/180 TPS
Average time in last second: 5.65/5.5555553ms
Fluctuation: 186.8000030517578/190 TPS
Average time in last second: 5.357895/5.263158ms
Fluctuation: 196.39999389648438/200 TPS
Average time in last second: 5.09/5.0ms
Fluctuation: 206.1999969482422/210 TPS
Average time in last second: 4.8619046/4.7619047ms
Fluctuation: 216.1999969482422/220 TPS
Average time in last second: 4.6454544/4.5454545ms
Fluctuation: 225.8000030517578/230 TPS
Average time in last second: 4.443478/4.347826ms
Fluctuation: 235.8000030517578/240 TPS
Average time in last second: 4.2541666/4.1666665ms
Fluctuation: 244.39999389648438/250 TPS
Average time in last second: 4.096/4.0ms

Timings when the tick method needs 1000/tps - 1 ms:

Fluctuation: 10.0/10 TPS
Average time in last second: 100.0/100.0ms
Fluctuation: 20.0/20 TPS
Average time in last second: 50.0/50.0ms
Fluctuation: 30.0/30 TPS
Average time in last second: 33.333332/33.333332ms
Fluctuation: 40.0/40 TPS
Average time in last second: 25.0/25.0ms
Fluctuation: 50.0/50 TPS
Average time in last second: 20.0/20.0ms
Fluctuation: 60.0/60 TPS
Average time in last second: 16.666666/16.666666ms
Fluctuation: 70.0/70 TPS
Average time in last second: 14.285714/14.285714ms
Fluctuation: 80.0/80 TPS
Average time in last second: 12.5/12.5ms
Fluctuation: 90.0/90 TPS
Average time in last second: 11.111111/11.111111ms
Fluctuation: 100.0/100 TPS
Average time in last second: 10.0/10.0ms
Fluctuation: 110.0/110 TPS
Average time in last second: 9.090909/9.090909ms
Fluctuation: 120.0/120 TPS
Average time in last second: 8.333333/8.333333ms
Fluctuation: 130.0/130 TPS
Average time in last second: 7.6923075/7.6923075ms
Fluctuation: 140.0/140 TPS
Average time in last second: 7.142857/7.142857ms
Fluctuation: 150.0/150 TPS
Average time in last second: 6.6666665/6.6666665ms
Fluctuation: 160.0/160 TPS
Average time in last second: 6.25/6.25ms
Fluctuation: 170.0/170 TPS
Average time in last second: 5.882353/5.882353ms
Fluctuation: 180.0/180 TPS
Average time in last second: 5.5555553/5.5555553ms
Fluctuation: 189.8000030517578/190 TPS
Average time in last second: 5.263158/5.263158ms
Fluctuation: 200.0/200 TPS
Average time in last second: 5.0/5.0ms
Fluctuation: 210.0/210 TPS
Average time in last second: 4.7619047/4.7619047ms
Fluctuation: 220.0/220 TPS
Average time in last second: 4.5454545/4.5454545ms
Fluctuation: 230.0/230 TPS
Average time in last second: 4.347826/4.347826ms
Fluctuation: 240.0/240 TPS
Average time in last second: 4.1666665/4.1666665ms
Fluctuation: 250.0/250 TPS
Average time in last second: 4.0/4.0ms