egl/wayland: Fix destruction of event queue with proxies still attached.

Destroy the display wrapper proxy before destroying the event queue that the proxy is attached to.

This silences a warning that libwayland 1.22 emits for programs that use EGL/Wayland:

warning: queue 0x562a5ed2cd20 destroyed while proxies still attached: wl_display@1 still attached

Signed-off-by: Alexandros Frantzis alexandros.frantzis@collabora.com