Fixed bug where island level was not being saved.

The chunk scanner needs to report the result after the calculation to
the main class so it can update the cache and save it.

src/bskyblock/addon/level/ChunkScanner.java

@@ -178,7 +178,8 @@ public class ChunkScanner {
                     @Override
                     public void run() {
                         // Run any modifications
-
+                        // Save the value
+                        addon.setIslandLevel(island.getOwner(), result.score);
                         // All done.
                         if (asker.isPresent()) {
                             // Tell the asker the result