ARCodeWidget: Remove unnecessary call to OnSelectionChanged

Before the call to OnSelectionChange, m_code_edit and m_code_remove are
disabled and UpdateList calls m_code_list->clear(), thereby deselecting
any selected items.

When no items are selected, OnSelectionChange disables m_code_edit and
m_code_remove and then returns. Since that was already done, the call
doesn't change anything and can be removed.

Source/Core/DolphinQt/Config/ARCodeWidget.cpp

@@ -238,7 +238,6 @@ void ARCodeWidget::LoadCodes()
   m_code_remove->setEnabled(false);
 
   UpdateList();
-  OnSelectionChanged();
 }
 
 void ARCodeWidget::SaveCodes()