[Balance] Heavy battleship powercore

[Exterminator]

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Type: Ship Stats
Bug: Almost all heavy battleships had their powercore regen buffed
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Instead of just Rheinland Battleship, all other heavy battleships now have 450k/s power regen too.
The only exception is Ish'tar, which has kept 300k/s.
Checked on FL Stat and tested in game.

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Join the Corsair Brotherhood / [TBH]

[Haste]

Makes sense, probably. Lots of ships share(d) cores. Poor Ishtar.

While not intentional, I'm not sure - other than the Ishtar oversight - that this is actually worse than the intended buff for only the Bismarck. Will be somewhat interesting to see how this plays out.

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