MC-134668: Remove bad synchronized block from FileIOThread

This is causing the main thread to be blocked still.

Spigot-Server-Patches/0062-Chunk-save-queue-improvements.patch

@@ -1,4 +1,4 @@
-From 0d3a01c3188c4dbdccdb1b700707e790777a5968 Mon Sep 17 00:00:00 2001
+From 5cf50182ea6201707d4281655d44182f4272fd8f Mon Sep 17 00:00:00 2001
 From: Aikar <aikar@aikar.co>
 Date: Fri, 4 Mar 2016 18:18:37 -0600
 Subject: [PATCH] Chunk save queue improvements
@@ -137,10 +137,21 @@ index f969c036f3..2b0a088a6a 100644
                      NBTCompressedStreamTools.a(nbttagcompound, (DataOutput) dataoutputstream);
                      dataoutputstream.close();
 diff --git a/src/main/java/net/minecraft/server/FileIOThread.java b/src/main/java/net/minecraft/server/FileIOThread.java
-index 8c3537ab8d..170c239b77 100644
+index 8c3537ab8d..3c688f546c 100644
 --- a/src/main/java/net/minecraft/server/FileIOThread.java
 +++ b/src/main/java/net/minecraft/server/FileIOThread.java
-@@ -47,11 +47,12 @@ public class FileIOThread implements Runnable {
+@@ -38,20 +38,21 @@ public class FileIOThread implements Runnable {
+             IAsyncChunkSaver iasyncchunksaver = (IAsyncChunkSaver) this.c.get(i);
+             boolean flag;
+ 
+-            synchronized (iasyncchunksaver) {
++            //synchronized (iasyncchunksaver) { // Paper - remove synchronized
+                 flag = iasyncchunksaver.a();
+-            }
++            //} // Paper
+ 
+             if (!flag) {
+                 this.c.remove(i--);
                  ++this.e;
              }