Toggling combatant visibility also hides it from the GM

[Fyorl]

Originally reported by Huepfklotz#1353 https://discord.com/channels/170995199584108546/1065764070680186930/1096726561027276900

Short Description of bug: Toggle visibility now completly hides the actor in the combat tracker even for the gm. This works in the dnd5e system because it has a css fix. But in any other system this is missing (see attached images). The css should probably go to the foundry css.
Simple steps to reproduce the bug:
Use a system which is not DND5E. Toggle the visibility for one actor in the combat tracker. Actor completely disappears without any good way to get it back.
Screenshots and/or console errors:

[Fyorl]

There is a fix for this in v11 that should catch most cases. When I was testing this with the DSA system specifically, I did notice that it didn't have the .combat-sidebar class on the #combat tab however, which will need to be re-added for this fix to work, or the system will need to provide its own CSS rule here.