Fix assignment store setup
Fix assignment store setup

An 'id' attribute is necessary for populating the store will all the records. However, new items in the store get a new id, and we don't want to pass the new ids back to the server for deletion requests. So we duplicate the id as 'assignment_id' as well, and then everything plays nicely.

KarmaHater/WikiEduDashboard,alpha721/WikiEduDashboard,KarmaHater/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,feelfreelinux/WikiEduDashboard,majakomel/WikiEduDashboard,Wowu/WikiEduDashboard,MusikAnimal/WikiEduDashboard,MusikAnimal/WikiEduDashboard,alpha721/WikiEduDashboard,MusikAnimal/WikiEduDashboard,feelfreelinux/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,sejalkhatri/WikiEduDashboard,majakomel/WikiEduDashboard,Wowu/WikiEduDashboard,majakomel/WikiEduDashboard,feelfreelinux/WikiEduDashboard,feelfreelinux/WikiEduDashboard,Wowu/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,sejalkhatri/WikiEduDashboard,sejalkhatri/WikiEduDashboard,KarmaHater/WikiEduDashboard,sejalkhatri/WikiEduDashboard,KarmaHater/WikiEduDashboard,alpha721/WikiEduDashboard,alpha721/WikiEduDashboard,WikiEducationFoundation/WikiEduDashboard,Wowu/WikiEduDashboard,sejalkhatri/WikiEduDashboard,MusikAnimal/WikiEduDashboard,majakomel/WikiEduDashboard