Move list identifier constructor `list{` to scanner

[aspeddro]

I think we can simplify this part of the query if we check list{ in the scanner.

https://github.com/nkrkv/tree-sitter-rescript/blob/f2be69c639346cad0126c64ca256aa931467e008/queries/highlights.scm#L16-L21

Some editors don't support priority property, see helix-editor/helix#4356 (comment)