Icons folder cleaning wave two (#76788)

## About The Pull Request

Further continous organizing and cleaning the Icons folder. There are
still some minior nitpicks left to do, but I reached my daily sanity
expenses limit again, and the faster these get in the less issues for
both me and others later. Also cleans some mess I caused by my blindness
last PR.

## Why It's Good For The Game

Saner spriters = better sprites

code/modules/wiremod/shell/brain_computer_interface.dm

@@ -1,7 +1,7 @@
 /obj/item/organ/internal/cyberimp/bci
 	name = "brain-computer interface"
 	desc = "An implant that can be placed in a user's head to control circuits using their brain."
-	icon = 'icons/obj/wiremod.dmi'
+	icon = 'icons/obj/science/circuits.dmi'
 	icon_state = "bci"
 	visual = FALSE
 	zone = BODY_ZONE_HEAD
@@ -237,7 +237,7 @@
 /datum/action/innate/bci_charge_action
 	name = "Check BCI Charge"
 	check_flags = NONE
-	button_icon = 'icons/obj/power.dmi'
+	button_icon = 'icons/obj/machines/cell_charger.dmi'
 	button_icon_state = "cell"
 
 	var/obj/item/circuit_component/bci_core/circuit_component