WX: Replace SetIcon with SetIcons(wxIconBundle)

Setting a single icon at a single resolution doesn't scale well,
Windows requires a 16x16 icon for the window and a 32x32/48x48 for
the taskbar. Providing all icons produces less pixellated results at
HiDPI.

Source/Core/DolphinWX/NetPlay/NetPlaySetupFrame.cpp

@@ -43,11 +43,7 @@ NetPlaySetupFrame::NetPlaySetupFrame(wxWindow* const parent, const CGameListCtrl
   IniFile::Section& netplay_section = *inifile.GetOrCreateSection("NetPlay");
 
   CreateGUI();
-  {
-    wxIcon icon;
-    icon.CopyFromBitmap(WxUtils::LoadScaledResourceBitmap("Dolphin", this));
-    SetIcon(icon);
-  }
+  SetIcons(WxUtils::GetDolphinIconBundle());
 
   {
     std::string temp;