clients: ivi-shell-user-interface.c ,Add wl_display_roundtrip in function of WLbuffer creation

> Hmm, wonder where the other roundtrip is. Hopefully it happens before
> you create any wlbuffers, so that the wlshm.format events are
> guaranteed to been received.

Signed-off-by: Nobuhiko Tanibata <NOBUHIKO_TANIBATA@xddp.denso.co.jp>
clients: simple-egl,Delete unnecessary if condition.

> You are still adding the 'if (states)' which was not there originally.
> What I meant was, you should not have done any modifications to this
> function. This is an xdg_shell event handler, not for ivi_application

Signed-off-by: Nobuhiko Tanibata <NOBUHIKO_TANIBATA@xddp.denso.co.jp>
clients: simple-egl.c, clean up code

> You shouldn't have changed this in the first place.

Signed-off-by: Nobuhiko Tanibata <NOBUHIKO_TANIBATA@xddp.denso.co.jp>