fix(server): collapse webhook empty-state subtitle to fix mix format

Summary

• Format check on main is failing because subtitle={dgettext(...)} in the webhooks empty-state was wrapped across three lines after #10846 trimmed the string. mix format prefers the single-line form.
• Failing run: https://github.com/tuist/tuist/actions/runs/26043992028/job/76563065418

Test plan

• mix format --check-formatted server/lib/tuist_web/live/webhooks_live.html.heex passes locally

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