Modify end void rings generation (#722)

* Modify end void rings generation

* move to fix

* fix up

---------

Co-authored-by: MC_XiaoHei <xor7xiaohei@gmail.com>

leaves-server/src/main/java/org/leavesmc/leaves/LeavesConfig.java

@@ -1237,5 +1237,8 @@ public final class LeavesConfig {
         public enum CollisionBehavior {
             VANILLA, BLOCK_SHAPE_VANILLA, PAPER
         }
+
+        @GlobalConfig("vanilla-end-void-rings")
+        public boolean vanillaEndVoidRings = false;
     }
 }