Issue description:

Breaking ore blocks with a silk touch-enabed Meka-Tool produces both the block of ore, and the exp you would get for breaking it without silk touch. This is repeatable for effectively free exp.

Steps to reproduce:

1. Install and enable a Silk Touch Unit on a Meka-Tool
2. Break a block of ore that normally drops items. (Coal, redstone, diamond, quartz, etc)

Version:

Forge: 32.0.106
Mekanism: 10.0.8.431

I think in the mekatool this line:
if (exp > 0) { //If we have xp drop it block.dropXpOnBlockBreak(world, pos, exp);
should be like this:
if (exp > 0 && !silk) { //If we have xp drop it block.dropXpOnBlockBreak(world, pos, exp);
This way that if statement returns false when silk was true and thus not giving xp
Don't slap me if i'm wrong

This line