Fix HD Toast icon alignment

[liamsms]

Closes #3524

In the Figma spec, the icon has a padding-top of 1px in HD, the other densities use 2px.

In code, the padding-top value is combined with the margin-top value, I've updated it so that HD now uses 1px instead of 2px.

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🦋 Changeset detected

Latest commit: 1d42a416f1c43c090974912131521a7004919afa

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[joshwooding]

Thanks @liamsms, I've left a comment in the issue but I think we'll need design feedback since we should align to what's been done in Figma.