Fix: Submenu arrow position

[3kori]

Reposition the submenu arrows for smaller screen devices.

Trac ticket: 66013

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[3kori]

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[sabernhardt]

Nit: This has a lower specificity than the selector that includes .ab-top-secondary, so the ruleset could be moved a few lines earlier.

[audrasjb]

Thanks for the PR!
Looks almost good to me (see @sabernhardt 's comment above)… but don't you think the arrow is still a bit vertically misaligned?

[3kori]

Thank you, @sabernhardt & @audrasjb, for the reviews.
Fixing the specificity.
Lemmi, have another look at the alignment.