Revert "wayland: print waylands display erros"

This reverts commit 6e34b0ec1f50612cb2767da3dbc27be0be63041d.

There has always been an error message "proxy already has a listener" and
I couldn't reproduce where it is comming from until now. The display interface
already has a listener and we can't overwrite it. Now remove the code and avoid
this error message.

Conflicts:
	video/out/wayland_common.c