reverts specifically the prosthetic organ part of the cyber brain update + 1 minor change (#5333)

## About The Pull Request
That part wasn't finished. It won't! The other change just makes it so
non-vox aug brains can die from emps.

## Proof Of Testing
it didn't work then, it's gone now

## Changelog

🆑
balance: vox get to keep their min brain health threshold from emps,
removed it from roundstart aug brains.
del: surplus cybernetic brain is gone again
/🆑

code/datums/quirks/negative_quirks/prosthetic_organ.dm

@@ -1,5 +1,4 @@
-// BUBBER EDIT: moved to modular_zubbers\code\datums\quirks\negative_quirks\prosthetic_organ_bubber.dm
-/* /datum/quirk/prosthetic_organ
+/datum/quirk/prosthetic_organ
 	name = "Prosthetic Organ"
 	desc = "An accident caused you to lose one of your organs. Because of this, you now have a surplus prosthetic!"
 	icon = FA_ICON_LUNGS
@@ -73,4 +72,4 @@
 	if(old_organ)
 		old_organ.Insert(quirk_holder, special = TRUE)
 	old_organ = null
- */
+