Draft: vulkan/wsi/wayland: Avoid creating display in `get_present_modes`
Call wsi_wl_display_init to create a temporary display only if there
is not a display in the wsi_wl_surface.
This fixes an issue where I see a wl_display_get_registry every time
vkgears-wayland is resized. Resizing also seems to be smoother.
I think this should be correct. But is there a better way to do this?
Calling wsi_wl_surface_display here doesn't work since it will try to
access the ->chain.
There are also a few other functions that call wsi_wl_display_init.
Ideally in a typical single-window application, it should only be called
once.