Remove last bit of chunk exists region file fix

CraftBukkit removed their implementation that caused this issue,
switching to Mojang's implementation which doesn't appear to share it. I
already removed the important bit in the last upstream merge, this is
just unused and unnecessary now. So we remove it.

Spigot-Server-Patches/0053-Expose-server-CommandMap.patch

@@ -0,0 +1,21 @@
+From bf934f8ce2b8aed42e8412904cf5bd84f5163e3d Mon Sep 17 00:00:00 2001
+From: kashike <kashike@vq.lc>
+Date: Thu, 3 Mar 2016 02:15:57 -0600
+Subject: [PATCH] Expose server CommandMap
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+index 5302bb283..cab671d68 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+@@ -1567,6 +1567,7 @@ public final class CraftServer implements Server {
+         return helpMap;
+     }
+ 
++    @Override // Paper - add override
+     public SimpleCommandMap getCommandMap() {
+         return commandMap;
+     }
+-- 
+2.12.2.windows.2
+