Fix: Incorrect Mental Corruption proc

[BWStripes]

Had a complaint from an SK that mental corruption was proccing an Ice effect.

Lines 3011 and 3012 from spell_effects.cpp (v1072):

case 2576: //mental corruption
procid = 2712;


The ProcID for Mental Corruption Strike according to Lucy (and the spells_us.txt shipped with titanium) is 2717. Concoction of Ice III is 2712.

[KLS]

That code all seems pretty obsolete to me actually, comparing it to current spell data.. whatever problem it was trying to fix no longer seems to be an issue and we should be reliably able to pull the correct proc from the spell data instead of hard-coding it like that.