dbus: Fix the MPRIS version in the header comments

Change the mpris version to 2.2 as VLC implements it.

modules/control/dbus/dbus_introspect.h

 /*****************************************************************************
- * dbus_introspect.h : dbus control module (mpris v2.1) - introspection data
+ * dbus_introspect.h : dbus control module (mpris v2.2) - introspection data
  *****************************************************************************
  * Copyright © 2006-2011 Rafaël Carré
  * Copyright © 2007-2011 Mirsal Ennaime

modules/control/dbus/dbus_player.c

 /*****************************************************************************
- * dbus_player.c : dbus control module (mpris v1.0) - /Player object
+ * dbus_player.c : dbus control module (mpris v2.2) - Player object
  *****************************************************************************
  * Copyright © 2006-2011 Rafaël Carré
  * Copyright © 2007-2011 Mirsal Ennaime

modules/control/dbus/dbus_player.h

 /*****************************************************************************
- * dbus_player.h : dbus control module (mpris v1.0) - /Player object
+ * dbus_player.h : dbus control module (mpris v2.2) - Player object
  *****************************************************************************
  * Copyright © 2006-2008 Rafaël Carré
  * Copyright © 2007-2010 Mirsal Ennaime

modules/control/dbus/dbus_root.c

 /*****************************************************************************
- * dbus_root.c : dbus control module (mpris v1.0) - root object
+ * dbus_root.c : dbus control module (mpris v2.2) - Root object
  *****************************************************************************
  * Copyright © 2006-2008 Rafaël Carré
  * Copyright © 2007-2011 Mirsal Ennaime

modules/control/dbus/dbus_root.h

 /*****************************************************************************
- * dbus_root.h : dbus control module (mpris v1.0) - root object
+ * dbus_root.h : dbus control module (mpris v2.2) - Root object
  *****************************************************************************
  * Copyright © 2006-2008 Rafaël Carré
  * Copyright © 2007-2010 Mirsal Ennaime

modules/control/dbus/dbus_tracklist.c

 /*****************************************************************************
- * dbus_tracklist.c : dbus control module (mpris v2.1) - TrackList interface
+ * dbus_tracklist.c : dbus control module (mpris v2.2) - TrackList interface
  *****************************************************************************
  * Copyright © 2006-2011 Rafaël Carré
  * Copyright © 2007-2011 Mirsal Ennaime

modules/control/dbus/dbus_tracklist.h

 /*****************************************************************************
- * dbus_tracklist.h : dbus control module (mpris v1.0) - /TrackList object
+ * dbus_tracklist.h : dbus control module (mpris v2.2) - TrackList object
  *****************************************************************************
  * Copyright © 2006-2008 Rafaël Carré
  * Copyright © 2007-2010 Mirsal Ennaime