[Dillo-dev] PATCH: uicmd.cc prefs.save_dir cleanup

Jeremy wrote:

uicmd.cc exports a get()/set() interface to the default save directory that is never used elsewhere, and used only trivially internally. It also rereads prefs.save_dir at every save, which is redundant. It would be simpler to have an init() interface that is called once. There would be no change to the user.

Patch attached. Thoughts?

Seems like a good change to make...