Fix theme margins

Fix spacing that was changed due to the restructuring of foldable tool
panels.

rtgui/lensgeom.h

@@ -35,7 +35,6 @@ protected:
     Gtk::CheckButton*   fill;
     bool                lastFill;
     sigc::connection    fillConn;
-    ToolParamBlock*     packBox;
 
     rtengine::ProcEvent EvTransMethod;
 public:
@@ -44,11 +43,6 @@ public:
     LensGeometry ();
     ~LensGeometry () override;
 
-    Gtk::Box* getPackBox ()
-    {
-        return packBox;
-    }
-
     void read           (const rtengine::procparams::ProcParams* pp, const ParamsEdited* pedited = nullptr) override;
     void write          (rtengine::procparams::ProcParams* pp, ParamsEdited* pedited = nullptr) override;
     void setBatchMode   (bool batchMode) override;