Re activate Zone Unfill All command, accidentally removed by a previous commit.

Fixes: lp:1795293
https://bugs.launchpad.net/kicad/+bug/1795293

pcbnew/tools/zone_filler_tool.cpp

@@ -2,7 +2,7 @@
  * This program source code file is part of KiCad, a free EDA CAD application.
  *
  * Copyright (C) 2014-2017 CERN
- * Copyright (C) 2014-2017 KiCad Developers, see AUTHORS.txt for contributors.
+ * Copyright (C) 2014-2018 KiCad Developers, see AUTHORS.txt for contributors.
  * @author Maciej Suminski <maciej.suminski@cern.ch>
  *
  * This program is free software; you can redistribute it and/or
@@ -203,5 +203,6 @@ void ZONE_FILLER_TOOL::setTransitions()
     Go( &ZONE_FILLER_TOOL::ZoneFill, PCB_ACTIONS::zoneFill.MakeEvent() );
     Go( &ZONE_FILLER_TOOL::ZoneFillAll, PCB_ACTIONS::zoneFillAll.MakeEvent() );
     Go( &ZONE_FILLER_TOOL::ZoneUnfill, PCB_ACTIONS::zoneUnfill.MakeEvent() );
+    Go( &ZONE_FILLER_TOOL::ZoneUnfillAll, PCB_ACTIONS::zoneUnfillAll.MakeEvent() );
     Go( &ZONE_FILLER_TOOL::SegzoneDeleteFill, PCB_ACTIONS::zoneDeleteSegzone.MakeEvent() );
 }