presentation-time: use enum entry description tags

Instead of describing each enum entry in the enum description,
use enum entry descriptions. This avoids the awkward list of
flags in the top-level description.

This has been possible for a long time, but wasn't correctly
handled by wayland-scanner until recently [1].

[1]: https://gitlab.freedesktop.org/wayland/wayland/-/merge_requests/151

Signed-off-by: Simon Ser <contact@emersion.fr>

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