Datagrid filters (such as Show/Hide Archived) were lacking any suitable

spacing, appearing right alongside the header or tabs. This gave a

pretty ugly appearance.
This change fixes that, adding some spacing between the title/tabs and

filter, and between multiple filters. We don't currently use multiple

filters anywhere, but in testing this, I found that multiple filters

would be stacked vertically, rather than horizontally. This has been

fixed as well.

Tested the dashboard, users page, and other datagrids.
Tested adding multiple filters.