Revert "Add path to allow testing locales when using cmake"

This reverts commit e48dbd94f9.

There is a pure CMake way of handling this one...

src/AudacityApp.cpp

@@ -1180,10 +1180,6 @@ bool AudacityApp::OnInit()
       audacityPathList);
 #endif //AUDACITY_NAME
 
-   FileNames::AddUniquePathToPathList(wxString::Format(wxT("%s/locale"),
-      progPath),
-      audacityPathList);
-
    FileNames::AddUniquePathToPathList(wxString::Format(wxT("%s/share/locale"),
       wxT(INSTALL_PREFIX)),
       audacityPathList);