Replace old Overflow algorithm (#6280)

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Content.Server/Fluids/Components/PuddleComponent.cs

@@ -48,11 +48,6 @@ namespace Content.Server.Fluids.Components
         [DataField("spillSound")]
         public SoundSpecifier SpillSound = new SoundPathSpecifier("/Audio/Effects/Fluids/splat.ogg");
 
-        /// <summary>
-        /// Whether or not this puddle is currently overflowing onto its neighbors
-        /// </summary>
-        public bool Overflown;
-
         [ViewVariables(VVAccess.ReadOnly)]
         public FixedPoint2 CurrentVolume => EntitySystem.Get<PuddleSystem>().CurrentVolume(Owner);