Android browser: open documents with the new viewer

Change-Id: Iae63a8ec591df912938e74d67cb173f591c2a93d
Reviewed-on: https://gerrit.libreoffice.org/11488
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
Tested-by: Tomaž Vajngerl <quikee@gmail.com>