Fixes dogborg cell lick recharge.

It was using the cell's maxcharge instead of actual charge, meaning that even empty cells would give charge and overcharged cells were completely ignored.

code/modules/mob/living/silicon/robot/dogborg/dog_modules_vr.dm

@@ -243,7 +243,7 @@
 				to_chat(user, "<span class='notice'>You finish off \the [target.name], and gain some charge!</span>")
 				var/mob/living/silicon/robot/R = user
 				var/obj/item/weapon/cell/C = target
-				R.cell.charge += C.maxcharge / 3
+				R.cell.charge += C.charge / 3
 				water.use_charge(5)
 				qdel(target)
 			return