fix: Gateway configuration options input error

Created by: weili520

Signed-off-by: TheYoungManLi cjl@kubesphere.io

What type of PR is this?

/kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes ##2466 (closed)

Special notes for reviewers:

https://user-images.githubusercontent.com/33231138/146114342-976f873c-0e42-4cda-a412-c0da6b31355e.mov

Does this PR introduced a user-facing change?

Gateway configuration options input error.

Additional documentation, usage docs, etc.: