Add usage message to ReloadCommand

Used when the wrong arguments are supplied, missed when we added the
permissions reload functionality.

Spigot-API-Patches/Add-command-to-reload-permissions.yml-and-require-co.patch

@@ -62,6 +62,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +                return true;
 +            } else if ("confirm".equalsIgnoreCase(args[0])) {
 +                confirmed = true;
++            } else {
++                Command.broadcastCommandMessage(sender, ChatColor.RED + "Usage: " + usageMessage);
++                return true;
 +            }
 +        }
 +        if (!confirmed) {