trivial silicon show_system_integrity() fix

broken percent calculation messed up health stat updates.
borg actual health and showed health % before this commit : 
200/200 = 150 %, 100/200 = 100 %, 0/200 = 50 %
drones before this commit : 
35/35 =>100 %, 17.5/35 = 75 %, 0/35 = 50 %