Minor improvement of entities background map settings

Reset the selected map when reloading the map list to fix the wrong selection being shown for one frame when navigating directories in the map selection popup.

Increase scrolling speed for consistency with other listboxes (scroll 3 entries instead of 1).

src/game/client/components/menus_settings.cpp

@@ -3303,7 +3303,6 @@ void CMenus::RenderSettingsDDNet(CUIRect MainView)
 		static SPopupMenuId s_PopupMapPickerId;
 		static CPopupMapPickerContext s_PopupMapPickerContext;
 		s_PopupMapPickerContext.m_pMenus = this;
-
 		s_PopupMapPickerContext.MapListPopulate();
 		Ui()->DoPopupMenu(&s_PopupMapPickerId, Ui()->MouseX(), Ui()->MouseY(), 300.0f, 250.0f, &s_PopupMapPickerContext, PopupMapPicker);
 	}
@@ -3406,7 +3405,7 @@ CUi::EPopupMenuFunctionResult CMenus::PopupMapPicker(void *pContext, CUIRect Vie
 
 	static CListBox s_ListBox;
 	s_ListBox.SetActive(Active);
-	s_ListBox.DoStart(20.0f, pPopupContext->m_vMaps.size(), 1, 1, -1, &View, false);
+	s_ListBox.DoStart(20.0f, pPopupContext->m_vMaps.size(), 1, 3, -1, &View, false);
 
 	int MapIndex = 0;
 	for(auto &Map : pPopupContext->m_vMaps)
@@ -3450,7 +3449,7 @@ CUi::EPopupMenuFunctionResult CMenus::PopupMapPicker(void *pContext, CUIRect Vie
 	pPopupContext->m_Selection = NewSelected >= 0 ? NewSelected : -1;
 	if(s_ListBox.WasItemSelected() || s_ListBox.WasItemActivated())
 	{
-		const CMapListItem SelectedItem = pPopupContext->m_vMaps[pPopupContext->m_Selection];
+		const CMapListItem &SelectedItem = pPopupContext->m_vMaps[pPopupContext->m_Selection];
 
 		if(SelectedItem.m_IsDirectory)
 		{
@@ -3483,6 +3482,7 @@ void CMenus::CPopupMapPickerContext::MapListPopulate()
 	str_format(aTemp, sizeof(aTemp), "maps/%s", m_aCurrentMapFolder);
 	m_pMenus->Storage()->ListDirectoryInfo(IStorage::TYPE_ALL, aTemp, MapListFetchCallback, this);
 	std::stable_sort(m_vMaps.begin(), m_vMaps.end(), CompareFilenameAscending);
+	m_Selection = -1;
 }
 
 int CMenus::CPopupMapPickerContext::MapListFetchCallback(const CFsFileInfo *pInfo, int IsDir, int StorageType, void *pUser)