Start hexo server with `-s` options do not work properly

[chen-assert]

Check List

• I have already read README.
• I have already searched existing issues and they are not help to me.
• I examined error or warning messages and it's difficult to solve.
• I am using the latest version of this repository.
• I am using the latest version of Hexo.
• My Node.js is matched the required version.

Describe the bug

The short options -s do not work properly.

Expected behavior

According to the hexo document, the command hexo server -s can used to start a hexo server on static mode, but it does not work, the server still work on watch mode.

How to reproduce

Use hexo server -s command to start a hexo server.

Screenshots

Environment information

No response

Additional context

I did some tiny research and printed out the args on server.js.
It seems that the s arg was taken specially treatment by Hexo.