window: Dont take width and height in window constructor

Always set this by scheduling an initial resize.
diff --git a/clients/smoke.c b/clients/smoke.c
index 2405d42..c1665ce 100644
--- a/clients/smoke.c
+++ b/clients/smoke.c
@@ -267,7 +267,7 @@
 	smoke.width = 200;
 	smoke.height = 200;
 	smoke.display = d;
-	smoke.window = window_create(d, smoke.width, smoke.height);
+	smoke.window = window_create(d);
 	smoke.widget = window_add_widget(smoke.window, &smoke);
 	window_set_title(smoke.window, "smoke");