ecore_wl2: ignore first configure cb after client change the window size explictly

ecore_wl2: ignore first configure cb after client change the window size explictly

aux_hint: wm.policy.win.user.geometry 1
if client used this hint, client can resize window size even thought basic window.
But client can get 1X1 configure size after set this hint.

we need to analyze the whole size negotiation process between client and server.

problem case:
ecore_evas_new: 1X1 (client->server)
ecore_evas_resize: 1920X1080 (client->server)
configure 1X1 (server->client)
client change the size 1X1 even thought they already request 1920X1080

this is hot fix because it only can ignore first configure after client size set.
we maybe need to use the serial value of ecore_wl2_win.

Change-Id: I1961a41a31e94e76f89d8db9fdb7793bd83d4ba1