Vote Counter should use greater than logic

[otoole-brendan]

EC committee vote quorum is supposed to be greater than 50% by design i.e. 4/6 or 2/3. Per the code - this is not the case and it's actually 3/6. This is a bug and should be fixed such that quorum for any future committee requires greater than 50% of votes

Per @Chris-Hibbert:

case QuorumRule.MAJORITY:
return ceilDivide(committeeSize, 2);

ceilDivide: (x, y) => {
y = Nat(y);
return Nat(Nat(x) + y - 1n) / y;
}

I'm wrong. The use of Nat there cause half to be enough for even numbers. But with three it does the right thing. I think that should be a bug.