fix: replace leetcode-cn graphql request query argument which cause 400

[TangliziGit]

Since last version released, the graphql request query argument on leetcode-cn web site have been changed. This commit just replace question into questionId and convert string fid to int.

Refs: https://github.com/skygragon/leetcode-cli/issues/216

[TangliziGit]

To support leetcode-cn, the language name should be changed into lower case. The leetcode.js plugin was just modified on line 329.

[luyanfei]

Great job! But you should not include leetcode.js commit in the merge request.

[TangliziGit]

Okay, I will remove it.