Placement config code cleanup

core/src/mindustry/world/Block.java

@@ -374,6 +374,13 @@ public class Block extends UnlockableContent{
         return this;
     }
 
+    public Object nextConfig(){
+        if(saveConfig && lastConfig != null){
+            return lastConfig;
+        }
+        return null;
+    }
+
     public void drawRequest(BuildPlan req, Eachable<BuildPlan> list, boolean valid){
         Draw.reset();
         Draw.mixcol(!valid ? Pal.breakInvalid : Color.white, (!valid ? 0.4f : 0.24f) + Mathf.absin(Time.globalTime(), 6f, 0.28f));
@@ -389,7 +396,7 @@ public class Block extends UnlockableContent{
         TextureRegion reg = getRequestRegion(req, list);
         Draw.rect(reg, req.drawx(), req.drawy(), !rotate ? 0 : req.rotation * 90);
 
-        if(req.hasConfig){
+        if(req.config != null){
             drawRequestConfig(req, list);
         }
     }