Don't call "focus" hook in client_focus()

Later on that call will be done through a FocusIn event.

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

objects/client.c

@@ -420,9 +420,6 @@ client_focus(client_t *c)
     /* X11 doesn't let you focus a window that isn't viewable */
     client_unban(c);
 
-    if (!c->nofocus)
-        client_focus_update(c);
-
     client_set_focus(c, !c->nofocus);
 }