Bug 1577 - Application configuration file location incorrect on Linux/case-sensitive Macs

On windows the capitalisation does not matter.
On Mac/Windows we use 'audacity' in path names, even if the directories wxWidgets suggests have 'Audacity'.

src/Prefs.cpp

@@ -149,7 +149,9 @@ void InitPreferences()
    wxString langCode = gPrefs->Read(wxT("/Locale/Language"), wxEmptyString);
    bool writeLang = false;
 
-   const wxFileName fn(wxStandardPaths::Get().GetResourcesDir(), wxT("FirstTime.ini"));
+   const wxFileName fn(
+      FileNames::ResourcesDir(), 
+      wxT("FirstTime.ini"));
    if (fn.FileExists())   // it will exist if the (win) installer put it there
    {
       const wxString fullPath{fn.GetFullPath()};