x11-wm/herbstluftwm: remove default autostart's patch

The autostart's patch doesn't work as expected. It will be simplier
to use bash-dependent autostart so removed this patch and add bash
to RUN_DEPENDS
(see https://forums.freebsd.org/threads/herbstluftwm-0-9-5.88019/).
The default autostart uses panel.sh which requires dzen2, add it to
RUN_DEPEDS.
Fix shell completions directories.
Remove the '/usr/local/' path from patch.
Pet portfmt.
Bump PORTREVISION.

Reported by: Vlad Biley <bileslav@gmail.com> (email)