Add logic to Projects::AllBranchesRule::MergeRequestApprovalSetting to load prevent_editing_approval_rules

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In Create Projects::BranchRules::MergeRequestAppro... (#504615 - closed) we created a new table and renamed some of the attributes to better suit the new system.

disable_overriding_approvers_per_merge_request has been renamed to prevent_editing_approval_rules so we need to create a method in Projects::AllBranchesRule::MergeRequestApprovalSetting to fetch project.disable_overriding_approvers_per_merge_request