Attempt to fix permanently opened region files

This line successfully closes files that are no longer tied to any
loaded chunk. It was sometimes problematic on large servers.
However, since I'm not completely sure if it doesn't provoke any data
loss or error, I've commented it out, waiting for a verification or
approval.

src/main/java/com/gmail/nossr50/util/blockmeta/chunkmeta/HashChunkManager.java

@@ -219,6 +219,8 @@ public class HashChunkManager implements ChunkManager {
                 removalCheckedMobs.clear();
                 iteratingMobs = false;
             }
+
+            // closeChunkStore(world, cx, cz);
         }
     }