Modification of LR87 LH2 config to match Isp stated by Aeronautix

Hello Felger,

Please disregard this pull request if you've got a more reliable source for the LR87 LH2 Isp, or deliberately changed it for gameplay reasons. This came out of Aeronautix, whose information on the LR87 LH2 does not seem reliable.

-Starman4308