Suggestion: default Add Ship filters to empty

[Burstaholic]

Since I'm always looking for a single, exact ship when using 'Add Ship,' the filters would be much more useful if they defaulted to none selected, instead of nearly all selected.

If I want to add my Tier 3 Science ship, just clicking 'Science' and 'Tier 3' is way faster than un-clicking everything but those two.

Thanks for all your hard work!