gl/wayland: Use consistent wl_display when creating work queue for proxy wrapper

Without this, glimagesink since wayland 727c7903 fails with
gst-launch-1.0: ../src/wayland-client.c:2181: wl_proxy_set_queue:
Assertion 'proxy->display == queue->display' failed.

Part-of: <gstreamer/gst-plugins-base!1247>
35 jobs for !1247 with backport-mr-1200-into-1.18-master in 31 minutes and 28 seconds (queued for 11 seconds)
merge request