Bugfix/table layouts

The min-width that set the width of the table component got lost in favour of a regular width in https://github.com/alphagov/spotlight/commit/c144e56cabb7329535eeae4c7f85526be6d72cf5

This means that wide tables on pages like http://localhost:3057/performance/register-to-vote/user-satisfaction end up overlapping with the more info content.

Swapping back to a min-width allows the table to break the float down on to the next line.