bookmark: remove a useless 'recordchange' in the amend code
We do not touch the bookmarks store in this code, just the active bookmark, not
covered by the transaction. So it seems we can safely drop this call and the
tests agree with us.
$ hg init
$ echo This is file a1 > a
$ hg add a
$ hg commit -m "commit #0"
$ ls
a
$ echo This is file b1 > b
$ hg add b
$ hg commit -m "commit #1"
$ hg co 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
B should disappear
$ ls
a