message: Use the tab's active title for `Export Text`
  Takes title from the tab instead of the TermControl
  Closes
diff: @@ -420,7 +420,9 @@ namespace winrt::TerminalApp::implementation
  // GH#11356 - we can't use the UWP apis for writing the file,
  // because they don't work elevated (shocker) So just use the
  // shell32 file picker manually.
  - path = co_await SaveFilePicker(*_hostingHwnd, [control](auto&& dialog) {
  + std::wstring filename{ tab.Title() };
  + filename = til::clean_filename(filename);
  + path = co_await SaveFilePicker(*_hostingHwnd, [filename = std::move(filename)](auto&& dialog) {
  THROW_IF_FAILED(dialog->SetClientGuid(clientGuidExportFile));
  try
  {
  @@ -434,8 +436,6 @@ namespace winrt::TerminalApp::implementation
  THROW_IF_FAILED(dialog->SetDefaultExtension(L"txt"));
  // Default to using the tab title as the file name
  - std::wstring filename{ control.Title() };
  - filename = til::clean_filename(filename);
  THROW_IF_FAILED(dialog->SetFileName((filename + L".txt").c_str()));
  });
  }
  