Deck board shared with multiple circles causes permissions issues if some users are member of both circles

[muppeth]

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Describe the bug If a board is shared between Circle A (read only permissions) and Circle B (write and manage), and if a user is a member of both circles, he gets permissions of Circle A but not B. This results in user not being able to edit board unless that board is then re-shared with the user individually or user leaves circle A.

To Reproduce Steps to reproduce the behavior:

1. Create circle A
2. Create circle B
3. Share deck board with circle A and do not allow edits or manage
4. Share deck board with circle B and allow edits and manage permissions
5. As a user (not owner of the deck board) join both circles and try to manage or edit deck board (eg. add tag)

Expected behavior The permission of the circle that does allow for edits should be taken as the main one for user who's in both circles.