`computeRealizedLPFeePercent` may be calculating LP fee take for a route incorrectly

The current logic calculates fees as though the whole route were v2 or v3. Since the router recently updated to support interleaving routes this is no longer a safe assumption.

see:
// Since routes are either all v2 or all v3 right now, calculate separately
and
if (trade.swaps[0].route.pools instanceof (v2)Pair) {

// computes realized lp fee as a percent
export function computeRealizedLPFeePercent(trade: Trade<Currency, Currency, TradeType>): Percent {
  let percent: Percent

  // Since routes are either all v2 or all v3 right now, calculate separately
  if (trade.swaps[0].route.pools instanceof Pair) {
    // for each hop in our trade, take away the x*y=k price impact from 0.3% fees
    // e.g. for 3 tokens/2 hops: 1 - ((1 - .03) * (1-.03))
    percent = ONE_HUNDRED_PERCENT.subtract(
      trade.swaps.reduce<Percent>(
        (currentFee: Percent): Percent => currentFee.multiply(INPUT_FRACTION_AFTER_FEE),
        ONE_HUNDRED_PERCENT
      )
    )
  } else {
    percent = ZERO_PERCENT
    for (const swap of trade.swaps) {
      const { numerator, denominator } = swap.inputAmount.divide(trade.inputAmount)
      const overallPercent = new Percent(numerator, denominator)

      const routeRealizedLPFeePercent = overallPercent.multiply(
        ONE_HUNDRED_PERCENT.subtract(
          swap.route.pools.reduce<Percent>((currentFee: Percent, pool): Percent => {
            const fee =
              pool instanceof Pair
                ? // not currently possible given protocol check above, but not fatal
                  FeeAmount.MEDIUM
                : pool.fee
            return currentFee.multiply(ONE_HUNDRED_PERCENT.subtract(new Fraction(fee, 1_000_000)))
          }, ONE_HUNDRED_PERCENT)
        )
      )

      percent = percent.add(routeRealizedLPFeePercent)
    }
  }

  return new Percent(percent.numerator, percent.denominator)
}