feat: show cursorline in full width code blocks

[sumit-sahrawat]

This small code change makes cursorline show up in code blocks.

I'm new at nvim lua, and I don't understand the code at all. I was trying to read the code and see if I could make this work and a little hit-and-trial got me here. I was curious how the cursorline worked on the language line but not on the code lines, and wanted to see if I could replicate the same behaviour for code lines as well.

I'm honestly not sure if this breaks anything else. Please let me know if this is a good idea and I can update the PR to fix docs/screenshots etc.

In my limited testing with the following config it's working well:

{
  "MeanderingProgrammer/render-markdown.nvim",
  opts = {
    code = {
      sign = false, -- from LazyVim
      width = "full",
      border = "thick",
      right_pad = 1, -- from LazyVim
    },
  },
}