Update license notification in signalbar implementation

This updates the license notification to use only the BSD license. The
changes were acknowledged by email (Kel Modderman <kel@otaku42.de>,
Mon, 2 Jul 2012 20:02:37 +1000).

Signed-hostap: Jouni Malinen <j@w1.fi>

wpa_supplicant/wpa_gui-qt4/signalbar.cpp

@@ -2,14 +2,8 @@
  * wpa_gui - SignalBar class
  * Copyright (c) 2011, Kel Modderman <kel@otaku42.de>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
  */
 
 #include <cstdio>

wpa_supplicant/wpa_gui-qt4/signalbar.h

@@ -2,14 +2,8 @@
  * wpa_gui - SignalBar class
  * Copyright (c) 2011, Kel Modderman <kel@otaku42.de>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
  */
 
 #ifndef SIGNALBAR_H