Don't delay chunk unloads during entity ticking

Leaf informed me this could cause ordering issues.

So, the risk if this occurring is lowered now anyways, but if an
entity causes a sync chunk load, it could process an unload...

We will tackle the problem better in a future commit

Also fixed another async-chunks=false issue

Spigot-Server-Patches/Asynchronous-chunk-IO-and-loading.patch

@@ -1902,7 +1902,7 @@ index 0000000000..1dfa8abfd8
 +}
 diff --git a/src/main/java/com/destroystokyo/paper/io/chunk/ChunkTaskManager.java b/src/main/java/com/destroystokyo/paper/io/chunk/ChunkTaskManager.java
 new file mode 100644
-index 0000000000..ff19d38f82
+index 0000000000..0745a2015a
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/io/chunk/ChunkTaskManager.java
 @@ -0,0 +0,0 @@
@@ -2297,7 +2297,7 @@ index 0000000000..ff19d38f82
 +                worker.flush();
 +            }
 +        }
-+        globalUrgentWorker.flush();
++        if (globalUrgentWorker != null) globalUrgentWorker.flush();
 +
 +        // flush again since tasks we execute async saves
 +        drainChunkWaitQueue();