lxqt-archiver's file dialog doesn't follow the settings of LXQt file dialog

[tsujan]

The reason is that lxqt-archiver uses its own, customized file dialog.

Possible Solution

There are two solutions:

1. lxqt-archiver's file dialog should read its config from and writes them to LXQt file dialog's config file; or
2. It should have a separate config file.

1 has two problems, at least. lxqt-archiver's file dialog has more settings than LXQt file dialog. And its size may be bigger (we don't want to increase the size whenever we use lxqt-archiver).

2 has the obvious problem that the user expects to see the common settings respected by lxqt-archiver's file dialog.

I think a mixture of 1 and 2 may be the solution. It needs to be examined in more detail.