rm unused action

GUI/View/Setup/FrameActions.cpp

@@ -16,8 +16,6 @@
 
 FrameActions::FrameActions()
 {
-    toggle_mask_value = new QAction("Toggle mask value");
-
     raise_mask = new QAction("Rise mask up");
     raise_mask->setIcon(QIcon(":/images/mask/bringtofront.svg"));
     raise_mask->setToolTip("Rise selected mask one level up (PgUp)");

GUI/View/Setup/FrameActions.h

@@ -21,7 +21,6 @@ class FrameActions {
 public:
     FrameActions();
 
-    QAction* toggle_mask_value;
     QAction* raise_mask;
     QAction* lower_mask;
     QAction* reset_view;