[ozone/wayland] Fix zaura_shell versioning check

This CL ensures that the WL client (Chromium/Wayland, Lacros) tells
the WL server (Exo) the higher Aura Shell protocol version it
supports, instead of the lower.

With this in place, code is safe against similar crashes observed in
bugs 1145642 and 1145695, where the Client (Lacros) was telling the
server (Exo) it supports a version higher than it actually does.

BUG=1145642, 1145695

Change-Id: Ia471748f0f3066eea901c189c06da3c1137c1cdf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518443


Auto-Submit: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Nick Yamane <nickdiego@igalia.com>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#824556}