DataViews: combine duplicate "enhancements" grouping in changelog

[simison]

What?

Removed duplicate entry for "enhancements" in the DataViews changelog for v10.3.0.

Why?

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How?

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Testing Instructions

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Screenshots or screencast

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[ntsekouras]

I rebased and I think it's fine not to add a new changelog entry for this PR. Let's merge, thanks!