Comment 29 for bug 1889128

Thanks, Michele. New rebased branch pushed:

https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/berick/lp1887429-lp1889128-hold-prefs-and-multi-v3

This adds support for the 'opac.default_phone' user setting and a patch to clear the patron barcode from the barcode input when the user clicks on 'place hold for this staff account' to avoid any potential confusion.