message: fix(gui): Allow selection of images in folders with extension
  This fixes selection of images contained in directories with a file extension
  (i.e. "openSUSE-Leap-42.3-DVD-x86_64.iso") in the open file dialog.
  Change-Type: patch
  Changelog-Entry: Fix selection of images in folders with file extension on Mac OS
diff: @@ -57,9 +57,9 @@ exports.selectImage = () => {
  //
  // See: https://github.com/probonopd/AppImageKit/commit/1569d6f8540aa6c2c618dbdb5d6fcbf0003952b7
  defaultPath: process.env.OWD,
  -
  properties: [
  - 'openFile'
  + 'openFile',
  + 'treatPackageAsDirectory'
  ],
  filters: [
  {
  