Collaborators.vue: use chosen role for invitation
Collaborators.vue: use chosen role for invitation

You just have to use Vue correctly.

Issue: #1238

usu/ecamp3,usu/ecamp3,usu/ecamp3,ecamp/ecamp3,pmattmann/ecamp3,ecamp/ecamp3,pmattmann/ecamp3,pmattmann/ecamp3,pmattmann/ecamp3,usu/ecamp3,ecamp/ecamp3,ecamp/ecamp3