Update audio/praat to latest upstream release

Release notes as always
https://www.fon.hum.uva.nl/praat/manual/What_s_new_.html

• got rid of flashing during a running cursor or when making a selection in the Sound window or the Picture window.
• corrected a bug that caused the buttons at the top of a manual window to be overwritten with text when scrolling.

While here, remove two reinplace-bits that no longer apply,
the source has changed to its own cast.