Admin: Use CSS variable for bulk edit focus color

[hmbashar]

Trac ticket: https://core.trac.wordpress.org/ticket/64757

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Props hmbashar, huzaifaalmesbah, mukesh27, joedolson, shailu25, audrasjb.

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[huzaifaalmesbah]

LGTM!

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[mukeshpanchal27]

Thanks for the PR. LGTM.

[shail-mehta]

The Bulk Edit focus color is now displaying correctly.

[audrasjb]

Color changes are good to go but it would be nice to align the labels vertically, and maybe add some margin betweeen elements.

[joedolson]

@audrasjb There are other tickets already open to address the bulk edit input fields, so I think keep this focused to the existing issue.