Custom CSS data: classes not proposed

[dbaeumer]

Tests: #67306

• follow steps
• open css file
• empty it and type :my-l

Observe code complete is empty

[octref]

Thanks, I fixed schema but forget to update the JSON parser, so it was reading pseudoclasses instead of pseudoClasses.

Fixed via ef0f902.

[octref]

For verifier: ensure this custom data would propose :my-link on completion:

{
  "version": 1,
  "pseudoClasses": [{
    "name": ":my-link",
    "description": ":any-link pseudo class. See details at https://preset-env.cssdb.org/features#any-link-pseudo-class"
  }]
}