present/wnmd: Remove no-op present_wnmd_flip_destroy

Reviewed-by: Roman Gilg <subdiff@gmail.com>
4 jobs for present-wnmd-cleanup in 4 minutes and 13 seconds (queued for 1 second)
Status Job ID Name Coverage
  Docker Image
passed #4439269
debian-testing

00:00:08

 
  Build And Test
passed #4439270
autotools

00:04:05

passed #4439271
meson

00:00:54

passed #4439272
meson-noglamor

00:00:41