Revert "Math: Fix memory leak with SmDocShell"

It breaks "make check"

This reverts commit d3cf6841

Change-Id: Iae8ef2a49a395e885aa8ab3658244836c9ce71c5
Reviewed-on: https://gerrit.libreoffice.org/5021Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>

starmath/inc/ElementsDockingWindow.hxx

@@ -100,7 +100,6 @@ class SmElementsControl : public Control
 
 public:
     SmElementsControl(Window *pParent, const ResId& rResId);
-    ~SmElementsControl();
 
     void setElementSetId(sal_uInt16 aSetId);
 

starmath/source/ElementsDockingWindow.cxx

@@ -178,11 +178,6 @@ SmElementsControl::SmElementsControl(Window *pParent, const ResId& rResId) :
     maFormat.SetBaseSize(PixelToLogic(Size(0, 24)));
 }
 
-SmElementsControl::~SmElementsControl()
-{
-    delete mpDocShell;
-}
-
 void SmElementsControl::setVerticalMode(bool bVerticalMode)
 {
     mbVerticalMode = bVerticalMode;