bug#61998: 29.0.60; `treesit-simple-indent-presets' `prev-line' has incorrect position

[Troy Brown]

I'm expecting `prev-line' to return the position of the first non-space
character on the previous line.  However, it instead returns the number
of characters skipped on the previous line to move to the first
non-space character (i.e., the result of calling `skip-chars-foward').

It appears there is a missing call to `point' that should appear at the
end of the defined lambda.

         (cons 'prev-line (lambda (_n _p bol &rest _)
                            (save-excursion
                              (goto-char bol)
                              (forward-line -1)
-                             (skip-chars-forward " \t"))))
+                             (skip-chars-forward " \t")
+                             (point))))