Fix up handling of positional options in cvar handling.

- Fix up handling of positional options in cvar handling so that executables
  other than app can handle them properly.
- Fix command-line arguments for xenia-vfs-dump.

src/xenia/base/main_win.cc

@@ -105,7 +105,8 @@ int Main() {
     std::wcstombs(argva[n], argv[n], len + 1);
   }
 
-  cvar::ParseLaunchArguments(argca, argva);
+  cvar::ParseLaunchArguments(argca, argva, entry_info.positional_usage,
+                             entry_info.positional_options);
 
   // Widen all remaining flags and convert to usable strings.
   std::vector<std::wstring> args;