WP.org Search: The block inside is not full width, and has a label above

[jasmussen]

The block should be full width, we shouldn't show an added search label above the box.

This is similar to search boxes elsewhere:

[ryelle]

Looks like there was a regression somewhere, that padding should not be there. But the label is intentional, it was decided here to bring back the visible label since the placeholder is instructional.

management note: I moved this to the wporg-mu-plugins because that controls the header search box

[ryelle]

Pulling in the comment from #550 that the search spacing is also broken on small screens, it should have spacing here:

Production	Expectation