Don't select an access level if already selected.
1. This is in regard to the protected branches feature spec. 2. For example, if "Masters" is already selected, don't re-select "Masters" during the spec. 3. This is due to a bug in the frontend implementation, where selecting an already-selected access level _deselects_ it, which is something we don't need. I'll create a separate issue for this. 4. This hasn't turned up before, because we were manually creating missing access levels prior to e805a647. Now, we just use nested attributes, and missing access levels fail validation.
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