Refine the previous change

Refine the previous change

* lisp/progmodes/ruby-ts-mode.el (ruby-ts--s-p-query): Fix a typo.
(ruby-ts--syntax-propertize): Use pcase-exhaustive to avoid typos.
Put the last s-t property after heredoc's end (apparently
parse-partial-sexp likes that more).  Move first s-t property on
percent literals to the very beginning (to be refined later).
Differentiate the %r{} literals from /.../ ones -- tree-sitter
parses them exactly the same.