Press This category tabs background color is white

[dd32]

Press This's Category metabox's tabs have a White background on the <a>.

This background is coming from body.press-this .tabs a, body.press-this .tabs a:hover . The .tabs class is not used elsewhere and appears to be a left over fragment from something else.

Attached patch removes the stylings for the .tab class, and brings the styling inline with the standard editor by applying a #333 link colour whilst the tab is selected.

[dd32]

Merging into #15561