DolphinQt: Use qOverload where applicable

Provides the same behvaior, but in a much more concise manner.

Source/Core/DolphinQt/Config/Graphics/GraphicsInteger.cpp

@@ -20,9 +20,7 @@ GraphicsInteger::GraphicsInteger(int minimum, int maximum, const Config::ConfigI
 
   setValue(Config::Get(setting));
 
-  connect(this, static_cast<void (GraphicsInteger::*)(int)>(&GraphicsInteger::valueChanged), this,
-          &GraphicsInteger::Update);
-
+  connect(this, qOverload<int>(&GraphicsInteger::valueChanged), this, &GraphicsInteger::Update);
   connect(&Settings::Instance(), &Settings::ConfigChanged, [this] {
     QFont bf = font();
     bf.setBold(Config::GetActiveLayerForConfig(m_setting) != Config::LayerType::Base);