webstaff: make datepicker respect format.date OUS

[Galen Charlton]

The egDateInput directive currently defaults to using the "shortDate" date format, when it really ought to be using the format.date library setting.

Evergreen master

[Galen Charlton (gmc)]

A patch is available as commit e4a56602f in the working/Evergreen repository:

http://git.evergreen-ils.org/?p=working/Evergreen.git;a=commit;h=e4a56602fba68cfed61a73d34091ea287bc8cfc6

The patch is part of the collab/gmcharlt/webstaff-sprint3 branch, but can just be cherry-picked.

[Mike Rylander (mrylander)]

This is already incorporated into the main sprint-3 branch, so leaving this here for now. If we don't merge sprint-3 before beta, I'll pull this in.