Fixed bug in staff client offline mode.

https://bugs.launchpad.net/evergreen/+bug/1089657

In list.js at start you create obj.columns for lineno, but later
you don`t process this value so it`s return default render
function.  This code repairs this.

Signed-off-by: Dmitry Nechai <nechai.dmitry@gmail.com>
Signed-off-by: Jason Stephenson <jstephenson@mvlc.org>
Minor change to chrome/content/util/list.js.

Change the initializer of this.count_for_display from 0 to 1 in
order to match the counting of other lists in the client and to
provide something that staff are likely to prefer.

Signed-off-by: Jason Stephenson <jstephenson@mvlc.org>