Cleans up top ten list

src/main/java/world/bentobox/level/objects/TopTenData.java

@@ -24,6 +24,8 @@ public class TopTenData implements DataObject {
     private Map<UUID, Long> topTen = new LinkedHashMap<>();
 
     public Map<UUID, Long> getTopTen() {
+        // Remove any entries that have level values less than 1
+        topTen.values().removeIf(l -> l < 1);
         return topTen.entrySet().stream()
                 .sorted(Collections.reverseOrder(Map.Entry.comparingByValue())).limit(10)
                 .collect(Collectors.toMap(