Previously, the damage display gauge only showed the integrity for subsystem types. This was fine if there were a 1:1 match, with each type only having 1 subsystem. If there were more then 1 subsystem of a given type though, it would not display accurate information to the player.
This PR sets the displayed subsystem integrity to that actual specific subsystem, not the aggregate. Tested and works as expected (screenshot attached) and fixes#3982.