bookmarks: don't use bookmarks.listbookmarks in local computations
bookmarks.listbookmarks is for wire-protocol use. The normal way to get
all the bookmarks on a local repository is repo._bookmarks.
Minimal hgk check
$ echo "[extensions]" >> $HGRCPATH
$ echo "hgk=" >> $HGRCPATH
$ hg init repo
$ cd repo
$ echo a > a
$ hg ci -Am adda
adding a
$ hg debug-cat-file commit 0
tree a0c8bcbbb45c
parent 000000000000
author test 0 0
revision 0
branch default
adda
$ cd ..