Qt/debugger: Don't update the symbols list unnecessarily

It only needs to be updated when we changes the symbols, not every time the code widget updates and it does take a while to update them so this fixes some delay when updating the code window.

Source/Core/DolphinQt2/Debugger/CodeWidget.cpp

@@ -147,7 +147,7 @@ void CodeWidget::ConnectWidgets()
   connect(m_search_address, &QLineEdit::textChanged, this, &CodeWidget::OnSearchAddress);
   connect(m_search_symbols, &QLineEdit::textChanged, this, &CodeWidget::OnSearchSymbols);
 
-  connect(m_symbols_list, &QListWidget::itemSelectionChanged, this, &CodeWidget::OnSelectSymbol);
+  connect(m_symbols_list, &QListWidget::itemClicked, this, &CodeWidget::OnSelectSymbol);
   connect(m_callstack_list, &QListWidget::itemSelectionChanged, this,
           &CodeWidget::OnSelectCallstack);
   connect(m_function_calls_list, &QListWidget::itemSelectionChanged, this,
@@ -252,7 +252,6 @@ void CodeWidget::Update()
   Symbol* symbol = g_symbolDB.GetSymbolFromAddr(m_code_view->GetAddress());
 
   UpdateCallstack();
-  UpdateSymbols();
 
   m_code_view->Update();
   m_code_view->setFocus();

Source/Core/DolphinQt2/Debugger/CodeWidget.h

@@ -36,6 +36,7 @@ public:
   void SetAddress(u32 address, CodeViewWidget::SetAddressUpdate update);
 
   void Update();
+  void UpdateSymbols();
 signals:
   void BreakpointsChanged();
   void RequestPPCComparison(u32 addr);
@@ -44,7 +45,6 @@ private:
   void CreateWidgets();
   void ConnectWidgets();
   void UpdateCallstack();
-  void UpdateSymbols();
   void UpdateFunctionCalls(Symbol* symbol);
   void UpdateFunctionCallers(Symbol* symbol);