进行yggdrasil验证时ArrayIndexOutOfBoundsException

[org.jackhuang.hellominecraft.launcher.core.auth.YggdrasilAuthenticator:74](https://github.com/huanghongxun/HMCL/blob/master/HMCL/src/main/java/org/jackhuang/hellominecraft/launcher/core/auth/YggdrasilAuthenticator.java#L74)
如果在弹出的选择角色窗口点击取消的话, `s.sel`就为`-1`(`FAILED_TO_SELECT`), 造成下标越界.
