fix(ListBox): fix selected hover style regression

[tw15egan]

Closes #7490
Ref https://github.com/carbon-design-system/carbon/pull/7777/files#diff-2d8f4b8c5cc37d2869d1f6ac7a1a1ceb847d8634c26c7bf48fe69f0305dcd084R761

Fixes a regression introduced in #7777

Changelog

Changed

• Changed token values back to previously fixed values

Testing / Reviewing

Ensure a selected item in Dropdown has the correct values

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