Send correct size to fullscreen clients (FS#1093)

Titlebars are not visible for fullscreen clients, so it doesn't make sense to
substract the area used for the titlebar in ConfigureNotify events.

Signed-off-by: Uli Schlachter <psychon@znc.in>

objects/client.c

@@ -614,7 +614,8 @@ client_send_configure(client_t *c)
 {
     area_t geometry = c->geometry;
 
-    client_remove_titlebar_geometry(c, &geometry);
+    if (!c->fullscreen)
+        client_remove_titlebar_geometry(c, &geometry);
     xwindow_configure(c->window, geometry, c->border_width);
 }