Change energy cost for AE2 spatial storage

[Daudeuf]

Like in issue AppliedEnergistics/Applied-Energistics-2#5382 in the Applied Energistics 2's Github repo. I think it would be better to disable the "spatialPowerMultiplier" by setting it to 1.0, which would make spatial storage useful and usable in survival for sizes like 128^3.

[Mitchell5200]

I've been testing this in a dev world, and changing the exponent to 1.0 only really eliminates the need to make an efficient setup.
Test data below, with a 128^3 setup,
Energy cost at minimum 2.02%, 4.58 TAE/ 9.15 TFE, 2,862,500 dense energy cells required, 357,812 Superdense cells (MEGA)
Energy cost at maximum 100%, 2.68 TAE/ 5.37 TFE, 1675 dense energy cells required, ~210 (209.375) Superdense cells (MEGA)

In my eyes it is possible to survival a 128^3 cell, it'll take a bit (done that before myself in atm7), but i do agree it is a bit energy costly, i'll be leaving this open for now, as a self reminder to revisit this in the future, but for now, i don't want to completely eliminate the Efficiency mechanics at this time.