Update role should remove capturer

When updating the role of a user who have the role capturer, it should remove the capturer.

added Front end bug labels

added To Do label

assigned to @apoyen

added Doing label and removed To Do label

created branch 39-update-role-should-remove-capturer to address this issue

mentioned in merge request !61 (merged)

closed via merge request !61 (merged)

mentioned in commit d5f6b827