Fix placement of chunk tracking - Fixes #1199

Spigot had code that returned early in chunk add/remove methods.

This was causing our code added to set current chunks and counts to
be skipped over if the entity was default not persistent but made persistent.

This was the source of many issues

Fixes #1208

Spigot-Server-Patches/Configurable-Chunk-Inhabited-Timer.patch

@@ -23,7 +23,7 @@ index e634c3afd..54f23ea75 100644
 +    }
  }
 diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
-index bf3b64e37..6b13e1d7d 100644
+index d84cc9843..da7b59434 100644
 --- a/src/main/java/net/minecraft/server/Chunk.java
 +++ b/src/main/java/net/minecraft/server/Chunk.java
 @@ -0,0 +0,0 @@ public class Chunk {