Make sure sticky windows pop to the front if they get sticky while not being on a visible workspace.

This commit also reworks the way focusing sticky windows is prevented by not focusing them temporarily at all, but preventing the focus in the first place.

src/handlers.c

@@ -736,6 +736,7 @@ static void handle_client_message(xcb_client_message_event_t *event) {
                 con->sticky = !con->sticky;
 
             DLOG("New sticky status for con = %p is %i.\n", con, con->sticky);
+            output_push_sticky_windows();
         }
 
         tree_render();