edit: fixing missing model asignment for the group and cve forms
edit: fixing missing model asignment for the group and cve forms

This fixes a regression introduced via 02b7a37bd7 as the template is
also used for editing and not just adding.

anthraxx/arch-security-tracker,jelly/arch-security-tracker,archlinux/arch-security-tracker,anthraxx/arch-security-tracker,archlinux/arch-security-tracker,jelly/arch-security-tracker,anthraxx/arch-security-tracker