when and why was this hardcoded (#6289)

core/src/mindustry/game/Teams.java

@@ -234,8 +234,6 @@ public class Teams{
         public Queue<BlockPlan> blocks = new Queue<>();
         /** The current command for units to follow. */
         public UnitCommand command = UnitCommand.attack;
-        /** Target items to mine. */
-        public Seq<Item> mineItems = Seq.with(Items.copper, Items.lead, Items.titanium, Items.thorium);
 
         /** Quadtree for all buildings of this team. Null if not active. */
         @Nullable
@@ -370,4 +368,4 @@ public class Teams{
             '}';
         }
     }
-}
+}