fix: pass the language option for codeblock tag

[xihale]

What does it do?

I will pass the language option when I use either of highlight.js or prism.js for codeblock tag!

Pull request tasks

• [x] Add test cases for the changes.
• [x] Passed the CI test.

[github-actions[bot]]

How to test

git clone -b master https://github.com/xihale/hexo.git
cd hexo
npm install
npm test

[xihale]

Would you mind adding unit test cases toward your changes?

but, I don't know what unit test I should add, can you help me? Just tell me where I can find how to add unit test for hexo changes! Thanks!

Anyway, I will try it!

[xihale]

I added a unit test to test my changes and find a inconspicuous bug then fixed it.

[github-actions[bot]]

How to test

git clone -b master https://github.com/xihale/hexo.git
cd hexo
npm install
npm test