Updating CalculatorHistory to use a default destructor. (#723)

Its memory will be cleaned up by std::vector's destructor.

src/CalcManager/CalculatorHistory.cpp

@@ -69,11 +69,6 @@ shared_ptr<HISTORYITEM> const& CalculatorHistory::GetHistoryItem(_In_ unsigned i
     return m_historyItems.at(uIdx);
 }
 
-CalculatorHistory::~CalculatorHistory(void)
-{
-    ClearHistory();
-}
-
 void CalculatorHistory::ClearHistory()
 {
     m_historyItems.clear();

src/CalcManager/CalculatorHistory.h

@@ -43,7 +43,6 @@ namespace CalculationManager
         {
             return m_maxHistorySize;
         }
-        ~CalculatorHistory(void);
 
     private:
         std::vector<std::shared_ptr<HISTORYITEM>> m_historyItems;