Sorry this reply is so late, I just compared the differences, mine shopped with the older layout. I imagine the ground wire is omitted because of redundancy. The barrel is already grounded through the chassis because it makes direct contact and this tab is another connection to the barrel. If it's already installed, there's no harm in leaving it or taking it off. If you leave it and there's a tad bit of noise, it's a simple removal to eliminate a possible ground loop, though I don't imagine it'd be a huge problem.
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