Solved: Xreader to have a preference to choose for default view

[nd3w]

First, thanks for this light PDF reader.
Every time I open Xreader, it uses Page View, while I like Reader View. I think it'll be great if we can choose the default view in Preference.

[ArtCodesArt]

@spamegg1 in #515 suggested to use the "Save current settings as default" option under Edit.