fix: dropdown-menu-shortcut.svelte to work in rtl layouts

[jonsamwell]

Updated dropdown-menu-shortcut.svelte to use margin-inline-start (ms-auto) so it works in rtl layouts

Before fix:

With fix applied:

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Latest commit: 273fbdf

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[AdrianGonz97]

Closing as stale. However, we'll keep the related issue open.