Kill fe_set_hilight()

It just duplicates functionality and this fixes:

- alert_taskbar chanopt not being respected
- tab color being incorrect when highlight print events are eaten

src/fe-gtk/fe-gtk.c

@@ -557,16 +557,6 @@ fe_set_topic (session *sess, char *topic, char *stripped_topic)
 	}
 }
 
-void
-fe_set_hilight (struct session *sess)
-{
-	if (sess->gui->is_tab)
-		fe_set_tab_color (sess, 3);	/* set tab to blue */
-
-	if (prefs.hex_input_flash_hilight && (!prefs.hex_away_omit_alerts || !sess->server->is_away))
-		fe_flash_window (sess); /* taskbar flash */
-}
-
 static void
 fe_update_mode_entry (session *sess, GtkWidget *entry, char **text, char *new_text)
 {