Fix MIME types in "Import video animation"
This changes KoFileDialog
to follow QFileDialog
's convention of using "application/octet-stream" to represent "All files (*)" (https://doc.qt.io/qt-5/qfiledialog.html#setMimeTypeFilters).
This changes KoFileDialog
to follow QFileDialog
's convention of using "application/octet-stream" to represent "All files (*)" (https://doc.qt.io/qt-5/qfiledialog.html#setMimeTypeFilters).