Domina Subjugator improvement

Right now it's not a very good ship for its tier and cost, compared to alternative choices.
To improve it, have its Nullify ability prioritize enemy Titans, then Capital ships, then Cruisers and Frigates. Otherwise they'd waste it on smaller ships first. Since this is a cruiser ability, it's very hard to micro them during battle, instead the autocast logic should be optimized.
I believe this small change will make researching and building this ship worth it in some cases instead of simply building more of other ships.