[openstreetmap-website] Search box styling is broken in Firefox 30 (#756)

[Tom Hughes]

Firefox 30 seems to have broken the styling of the search box - the "Go" button has grown by two pixels vertically so that it no longer matches the input field and also causes a white line to appear at the bottom.

We appear to be relying on `line-spacing: 20px` on input buttons to set the height, but in FF30 the height is actual coming out as 22px. Reducing vertical padding from 5 to 4 fixes it for FF30 but would presumably break other browsers.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/756
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