CDUtils: Amend function names

Amends the function names to follow our coding style.

Source/Core/DolphinWX/GameListCtrl.cpp

@@ -397,7 +397,7 @@ void GameListCtrl::RefreshList()
   if (SConfig::GetInstance().m_ListDrives)
   {
     std::unique_lock<std::mutex> lk(m_title_database_mutex);
-    for (const auto& drive : Common::cdio_get_devices())
+    for (const auto& drive : Common::GetCDDevices())
     {
       auto file = std::make_shared<UICommon::GameFile>(drive);
       if (file->IsValid())

Source/Core/DolphinWX/MainMenuBar.cpp

@@ -72,7 +72,7 @@ wxMenu* MainMenuBar::CreateFileMenu() const
 {
   auto* const external_drive_menu = new wxMenu;
 
-  const std::vector<std::string> drives = Common::cdio_get_devices();
+  const std::vector<std::string> drives = Common::GetCDDevices();
   // Windows Limitation of 24 character drives
   for (size_t i = 0; i < drives.size() && i < 24; i++)
   {