Group permission level dropdwn should be hidden from non group owners in the group members page
Steps to reproduce
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Create a group named one
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Add user0 as Reporter (could be anything but Owner) to group one
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Create a subgroup named two and add user1 to group two as Developer (could be anything but Owner)
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Login as user0 and navigate to the group's two members page
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Since user0 is not an Owner, they should not see the permissions dropdown as shown in the following screenshot
![screenshot-localhost-3000_2017-03-07_20-47-38](/uploads/0441ad81daa3f2f0df4a66099858f4cc/screenshot-localhost-3000_2017-03-07_20-47-38.png)