Add missing checkReachable check for shulker boxes (#5453)

Spigot-Server-Patches/Fix-checkReach-check-for-Shulker-boxes.patch

@@ -0,0 +1,18 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
+Date: Sun, 4 Apr 2021 14:25:04 -0400
+Subject: [PATCH] Fix checkReach check for Shulker boxes
+
+
+diff --git a/src/main/java/net/minecraft/world/inventory/ContainerShulkerBox.java b/src/main/java/net/minecraft/world/inventory/ContainerShulkerBox.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/world/inventory/ContainerShulkerBox.java
++++ b/src/main/java/net/minecraft/world/inventory/ContainerShulkerBox.java
+@@ -0,0 +0,0 @@ public class ContainerShulkerBox extends Container {
+ 
+     @Override
+     public boolean canUse(EntityHuman entityhuman) {
++        if (!this.checkReachable) return true; // Paper - Add reachable override for ContainerShulkerBox
+         return this.c.a(entityhuman);
+     }
+