fix: requirepass allows connection with any non-empty password

[YuCai18]

修复bug #3085 ：解决requirepass是非空的但可通过任意密码连接

requirepass 为非空时填写任意字符串即可连接的原因

因为src/acl.cc文件中的Acl::InitLimitUser()函数的没有设置else分支，若 userpass 为空且requirepass不为空，limit 用户就会被设置为 nopass（免密），任何密码都能通过；若userpass 和 requirepass 都为空，所有用户都是管理员；若userpass 不为空且requirepass为空就会报(error) ERR Client sent AUTH, but no password is set的错误。

修改后的运行截图

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[spastorclovr]

Hello 👋

This does not seem to be ported to the 4.0.2 branch. Is there a plan to do it?