git-branchmove: Always pass --no-verify to 'git push'

git-branchmove: Always pass --no-verify to 'git push'

We are not doing the kind of push for which git pre-push hooks are written, so
they will often fail.  In particular, 'git branchmove' is primarily intended
for moving WIP branches around, whereas pre-push hooks are usually for the
purpose of preventing accidental pushes of unpolished work to public branches.
With this in mind, I think we should try passing --no-verify unconditionally,
instead of providing an option.

Signed-off-by: Sean Whitton <spwhitton@spwhitton.name>