Don't completely clip into visible range in treesit_record_change

Don't completely clip into visible range in treesit_record_change

(Bug#61369)

From
    min (visible_end, max (visible_beg, new_end_byte)) - visible_beg
to
    max (visible_beg, new_end_byte) - visible_beg

* src/treesit.c (treesit_record_change): We don't clip the new end
into the visible range anymore.  If you think of it, when inserting in
a narrowed region, the visible region is always extended to
accommodate more text, rather than pushing text at the end to keep the
size of the visible region.