hgview #145557 remove next/prev diff actions from toolbar [rejected]

This is already done in the main window at `0f6fcebcd9cb <http://hg.logilab.org/master/hgview/rev/0f6fcebcd9cb>`_

.. admonition:: How to reproduce

$ hg qv -I qt -n setup.py
$ hg qv -I qt setup.py

prioritynormal
typetask
done in<not specified>
load0.000
load left0.000
closed by<not specified>
patch[qt4] move diff action from toolbar to context menu in file dialogs [folded]