Fix c-ts-mode indentation for 2nd line in block comment (bug#60270)

Fix c-ts-mode indentation for 2nd line in block comment (bug#60270)

If the first line is "/*" or "/*   ", indent like this:

/*
   aaa

If the first line is "/*   some text", indent like this:

/*   some text
     aaa

* lisp/progmodes/c-ts-mode.el (c-ts-mode--indent-styles):
(c-ts-mode--looking-at-star): Minor refactor.
(c-ts-mode--comment-2nd-line-matcher)
(c-ts-mode--comment-2nd-line-anchor): New functions.
* lisp/treesit.el (treesit-simple-indent-presets):
prev-adaptive-prefix doesn't handle the comment-start-skip case (i.e,
2nd line) anymore.  (Handled by the new matcher.)