Fix 2029: 150% Zoom & IE = Thinner Searchbox

I'm not sure what caused this and I couldn't reproduce it when the "div id="service-alert"" had some content in it ("... Development Environment... "), but in production this div is empty.

The padding-top should fix the issue and I didn't notice any visual changes in IE/Chrome (besides the fix ;) ).

Issue: https://github.com/NuGet/NuGetGallery/issues/2029