fix(relayer): profitability changes

[cyberhorsey]

used to have to multiply by 1.05 for padding, no longer necessary with previous bridge fee changes. Legacy code, now removed.

As well, the optimism txmgr defines it's fee calculation as:

// calcGasFeeCap deterministically computes the recommended gas fee cap given
// the base fee and gasTipCap. The resulting gasFeeCap is equal to:
//
//	gasTipCap + 2*baseFee.
func calcGasFeeCap(baseFee, gasTipCap *big.Int) *big.Int {
	return new(big.Int).Add(
		gasTipCap,
		new(big.Int).Mul(baseFee, two),
	)

So we should use baseFee * 2, not baseFee,when determining profitability.