hgweb: fix lack of "bookmarks" link in "/file" page of "paper" style
This patch also fixes same problem of "coal" style, because it re-uses
"filerevision.tmpl" of "paper" style.
"gitweb" and "monoblue" styles don't have such problems.
"spartan" style doesn't have "bookmarks" page definition itself.
$ 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