[Nerf] Custom large power cells

[Grayshift]

Currently it is abysmally easy to generate impossibly powerful energycells through workbenches.

Standard cerenkite cell: 15k capacity, 2 recharge rate
Standard erebite cell: 15k capacity, 10 recharge rate
Custom pharosium + cerenkite cell: Almost 1.2 million capacity, 25 recharge rate
Custom erebite cell: Almost 1.5 million capacity, almost 50 recharge rate.

This is a problem when combined with a borg with a force shield and/or recovery upgrades, making them invulnerable.

This patch brings custom cell values down into still powerful but not ludicrous ranges, more in line with the standard cells above.

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