LP#1671165: Fix web client build error

LP#1671165: Fix web client build error

Bower install was grabbing a later version of angular-cookies than we wanted,
resulting in errors when attempting to build the web client. Changing a
caret to a tilde in the bower.json files keeps us to a 1.5.x version of
angular-cookies, making web client builds happy.

Many thanks to Ben Shum for finding the solution to this problem!

Signed-off-by: Kathy Lussier <klussier@masslnc.org>
Signed-off-by: Ben Shum <ben@evergreener.net>
Conflicts:
	Open-ILS/web/js/ui/default/staff/bower.json