Fix byte-compile warning in treesit.el

Fix byte-compile warning in treesit.el

Originally treesit-simple-indent-presets was

'((parent-is . (lambda (type)
                 `(lambda (n p b)
                    (equal (treesit-node-type p)
                           ,type)))))

Then I changed it to

`((parent-is . ,(byte-compile
                 (lambda (type)
                   (lambda (n p b)
                     (equal (treesit-node-type p)
                            type))))))

but that generates "function already compiled" warning when
byte-compiling treesit.el.  The latest form shouldn't have any problem
anymore.

* lisp/treesit.el (treesit-simple-indent-presets): Change byte-compile
to plain evaluation.