Fix concurrency issue, remove sqlite from Bungee version and fix join message

bungee/src/main/java/me/lucko/luckperms/BungeeConfig.java

@@ -41,17 +41,11 @@ public class BungeeConfig implements LPConfiguration {
         return cfg;
     }
 
-
     @Override
     public String getServer() {
         return configuration.getString("server", "bungee");
     }
 
-    @Override
-    public String getPrefix() {
-        return configuration.getString("prefix", "&7&l[&b&lL&a&lP&7&l] &c");
-    }
-
     @Override
     public int getSyncTime() {
         return configuration.getInt("sql.sync-minutes", 3);