ivy--kill-buffer-action does not preserve index

[iquiw]

I am not sure the behavior is intentional.
I hope ivy--kill-buffer-action acts like ivy-switch-buffer-kill that preserve index after kill, but ivy--kill-buffer-action moves index to the last visited buffer (?).

[iquiw]

I tried to unify ivy--kill-buffer-action and ivy-switch-buffer-kill as follows.
iquiw@566e77f

As far as I can check, it works as expected.
@abo-abo Do you think it proper change?

[abo-abo]

Sounds OK. Please PR, I'll check again.

[iquiw]

Thank you! Sent PR.