Bundled Theme: Fix social links text decoration

[SainathPoojary]

This pull request fixes an issue in the Twenty Nineteen theme where social icons in the wp-block-social-links block appear without underlines in the editor but are incorrectly displayed with underlines on the frontend. This PR resolves the issue by adding a text-decoration: none; rule for anchor tags in the frontend, ensuring consistent styling with the editor.

Trac ticket: #61904

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