wayland: Set EGL swap interval to 0.

wayland: Set EGL swap interval to 0.

There's no need for EGL to do any timing, we do it in GTK already.

This fixes hangs in Mesa when we hide a surface after a SwapBuffers()
but before the frame callback arrives.
If we then reshow the surface and immediately render to it, Mesa would
still have a frame callback from before the hiding and forever poll()
waiting for the compositor to send the callback.

Fixes #5761