fix for rotated document to file manager transition: do a refresh

fixes part 2 of #1333
fix: save properly last open menu in reader

20fd6f902e1b1c2d47232442699d0d0254dba5f4 missed the saving part when
renaming the configuration variable.

Fixes #1335.
Merge pull request #1334 from hwhw/master

fix for rotated document to file manager transition: do a refresh