wayland/surface: Clear has_uncommitted_ack_configure when hiding

The 'has_uncommitted_ack_configure' state was added to make sure we're responding to 'xdg_surface.configure' events with 'xdg_surface.ack_configure' requests, as is necessary according to spec. What we didn't do was to clear this state when hiding, meaning that if we hid the surface after a configure event, but before the frame finished and we processed the 'has_uncommitted_ack_configure', we'd try to acknowledge the surface configuration after having destroyed the surface.

Closes: #3262 (closed)