Revert "Make lights dim under low power" (#19708)

Content.Server/Power/EntitySystems/PowerReceiverSystem.cs

@@ -156,25 +156,6 @@ namespace Content.Server.Power.EntitySystems
             return receiver.Powered;
         }
 
-        /// <summary>
-        /// Return the fraction of the load power that is actually supplied to this receiver, e.g. 1
-        /// if full power and 0 if no power. Better at handling brownouts compared to IsPowered().
-        /// Handles always-powered devices correctly.
-        /// </summary>
-        public float SupplyFactor(EntityUid uid, ApcPowerReceiverComponent? receiver = null)
-        {
-            if (!Resolve(uid, ref receiver, false))
-                return 1f;
-
-            if (receiver.PowerDisabled)
-                return 0f;
-
-            if (!receiver.NeedsPower)
-                return 1f;
-
-            return receiver.NetworkLoad.ReceivingPower / receiver.Load;
-        }
-
         /// <summary>
         /// Turn this machine on or off.
         /// Returns true if we turned it on, false if we turned it off.